id stringlengths 9 13 | submitter stringlengths 1 64 ⌀ | authors stringlengths 5 22.9k | title stringlengths 4 245 | comments stringlengths 1 548 ⌀ | journal-ref stringlengths 4 362 ⌀ | doi stringlengths 12 82 ⌀ | report-no stringlengths 2 281 ⌀ | categories stringclasses 793
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1804.03297 | P Ajith | Siddharth Dhanpal, Abhirup Ghosh, Ajit Kumar Mehta, Parameswaran
Ajith, B. S. Sathyaprakash | A "no-hair" test for binary black holes | 5 pages, 4 figures | Phys. Rev. D 99, 104056 (2019) | 10.1103/PhysRevD.99.104056 | LIGO-P1800056-v4 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the consequences of the black-hole "no-hair" theorem in general
relativity (GR) is that gravitational radiation (quasi-normal modes) from a
perturbed Kerr black hole is uniquely determined by its mass and spin. Thus,
the spectrum of quasi-normal mode frequencies have to be all consistent with
the same value of... | [
{
"created": "Tue, 10 Apr 2018 01:22:10 GMT",
"version": "v1"
}
] | 2019-05-29 | [
[
"Dhanpal",
"Siddharth",
""
],
[
"Ghosh",
"Abhirup",
""
],
[
"Mehta",
"Ajit Kumar",
""
],
[
"Ajith",
"Parameswaran",
""
],
[
"Sathyaprakash",
"B. S.",
""
]
] | One of the consequences of the black-hole "no-hair" theorem in general relativity (GR) is that gravitational radiation (quasi-normal modes) from a perturbed Kerr black hole is uniquely determined by its mass and spin. Thus, the spectrum of quasi-normal mode frequencies have to be all consistent with the same value of t... |
1312.6810 | Brian Dolan | Brian P. Dolan | On the thermodynamic stability of rotating black holes in higher
dimensions -- a comparison of thermodynamic ensembles | 41 pages, 5 figures; typo in appendix D corrected in v4 | null | 10.1088/0264-9381/31/13/135012 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Thermodynamic potentials relevant to the micro-canonical, the canonical and
the grand-canonical ensembles, associated with rotating black holes in
D-dimensions, are analysed and compared. Such black holes are known to be
thermodynamically unstable, but the instability is a consequence of a subtle
interplay between sp... | [
{
"created": "Tue, 24 Dec 2013 12:54:21 GMT",
"version": "v1"
},
{
"created": "Sat, 11 Jan 2014 17:01:18 GMT",
"version": "v2"
},
{
"created": "Thu, 8 May 2014 15:20:43 GMT",
"version": "v3"
},
{
"created": "Mon, 16 Jun 2014 15:14:12 GMT",
"version": "v4"
}
] | 2015-06-18 | [
[
"Dolan",
"Brian P.",
""
]
] | Thermodynamic potentials relevant to the micro-canonical, the canonical and the grand-canonical ensembles, associated with rotating black holes in D-dimensions, are analysed and compared. Such black holes are known to be thermodynamically unstable, but the instability is a consequence of a subtle interplay between spec... |
gr-qc/0605028 | M. Alessandra Papa | The LIGO Scientific Collaboration | Coherent searches for periodic gravitational waves from unknown isolated
sources and Scorpius X-1: results from the second LIGO science run | 35 pages, 30 figures | Phys.Rev.D76:082001,2007 | 10.1103/PhysRevD.76.082001 | LIGO-P050008-03 | gr-qc | null | We carry out two searches for periodic gravitational waves using the most
sensitive few hours of data from the second LIGO science run. The first search
is targeted at isolated, previously unknown neutron stars and covers the entire
sky in the frequency band 160-728.8 Hz. The second search targets the accreting
neutr... | [
{
"created": "Thu, 4 May 2006 22:41:39 GMT",
"version": "v1"
},
{
"created": "Wed, 31 May 2006 22:37:31 GMT",
"version": "v2"
}
] | 2012-08-27 | [
[
"The LIGO Scientific Collaboration",
"",
""
]
] | We carry out two searches for periodic gravitational waves using the most sensitive few hours of data from the second LIGO science run. The first search is targeted at isolated, previously unknown neutron stars and covers the entire sky in the frequency band 160-728.8 Hz. The second search targets the accreting neutron... |
2306.12455 | Faizuddin Ahmed | Faizuddin Ahmed | Gravitational lensing in a space-time with cosmic string within the
Eddington-inspired Born-Infeld gravity | 9 pages, 4 figures, accepted in IJGMMP
(https://doi.org/10.1142/S0219887824501871) | null | 10.1142/S0219887824501871 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | This study explores the deflection angle of photon rays or light-like
geodesics within the framework of Eddington-inspired Born-Infeld (EiBI) gravity
background space-time, taking into account the influence of cosmic strings. The
primary focus lies in deriving the effective potential of the system applicable
to both ... | [
{
"created": "Wed, 21 Jun 2023 05:22:32 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Jun 2023 08:27:24 GMT",
"version": "v2"
},
{
"created": "Fri, 29 Mar 2024 07:59:00 GMT",
"version": "v3"
}
] | 2024-04-01 | [
[
"Ahmed",
"Faizuddin",
""
]
] | This study explores the deflection angle of photon rays or light-like geodesics within the framework of Eddington-inspired Born-Infeld (EiBI) gravity background space-time, taking into account the influence of cosmic strings. The primary focus lies in deriving the effective potential of the system applicable to both nu... |
1204.1684 | Atsushi Higuchi | Atsushi Higuchi | Equivalence between the Weyl-tensor and gauge-invariant graviton
two-point functions in Minkowski and de Sitter spaces | 6 pages, revised and extended version of a talk; minor errors
corrected; proof for de Sitter space improved | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The two-point Wightman function of the free photon field defined in a
gauge-invariant manner is known to be equivalent to the field-strength
two-point function in any spacetime that is topologically trivial. We show that
the gauge-invariant graviton two-point function defined in a similar manner is
equivalent to the ... | [
{
"created": "Sat, 7 Apr 2012 21:46:43 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Aug 2013 10:32:32 GMT",
"version": "v2"
},
{
"created": "Thu, 22 Aug 2013 14:20:39 GMT",
"version": "v3"
}
] | 2013-08-23 | [
[
"Higuchi",
"Atsushi",
""
]
] | The two-point Wightman function of the free photon field defined in a gauge-invariant manner is known to be equivalent to the field-strength two-point function in any spacetime that is topologically trivial. We show that the gauge-invariant graviton two-point function defined in a similar manner is equivalent to the We... |
gr-qc/9607069 | Chris Isham | C.J. Isham | Topos Theory and Consistent Histories: The Internal Logic of the Set of
all Consistent Sets | 28 pages, LaTeX | Int.J.Theor.Phys. 36 (1997) 785-814 | 10.1007/BF02435786 | Imperial/TP/95--96/55 | gr-qc quant-ph | null | A major problem in the consistent-histories approach to quantum theory is
contending with the potentially large number of consistent sets of history
propositions. One possibility is to find a scheme in which a unique set is
selected in some way. However, in this paper we consider the alternative
approach in which all... | [
{
"created": "Sun, 28 Jul 1996 09:00:34 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Isham",
"C. J.",
""
]
] | A major problem in the consistent-histories approach to quantum theory is contending with the potentially large number of consistent sets of history propositions. One possibility is to find a scheme in which a unique set is selected in some way. However, in this paper we consider the alternative approach in which all c... |
1704.02461 | David McNutt | David D. McNutt, Don N. Page | Scalar Polynomial Curvature Invariant Vanishing on the Event Horizon of
Any Black Hole Metric Conformal to a Static Spherical Metric | 5 pages, minor corrections to two equations and references | Physical Review D, 95, 084044 (2017) | 10.1103/PhysRevD.95.084044 | Alberta-Thy 2-17 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a scalar polynomial curvature invariant that transforms
covariantly under a conformal transformation from any spherically symmetric
metric. This invariant has the additional property that it vanishes on the
event horizon of any black hole that is conformal to a static spherical metric.
| [
{
"created": "Sat, 8 Apr 2017 09:32:34 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Apr 2017 09:19:01 GMT",
"version": "v2"
}
] | 2017-04-26 | [
[
"McNutt",
"David D.",
""
],
[
"Page",
"Don N.",
""
]
] | We construct a scalar polynomial curvature invariant that transforms covariantly under a conformal transformation from any spherically symmetric metric. This invariant has the additional property that it vanishes on the event horizon of any black hole that is conformal to a static spherical metric. |
0906.0677 | Bin Wang | Jian-Hua He, Bin Wang, Pengjie Zhang | The imprint of the interaction between dark sectors in large scale
cosmic microwave background anisotropies | 17 pages, 9 figures, revised version, more discussions added,
accepted for publication in PRD | Phys.Rev.D80:063530,2009 | 10.1103/PhysRevD.80.063530 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dark energy interacting with dark matter is a promising model to solve the
cosmic coincidence problem. We study the signature of such interaction on large
scale cosmic microwave background (CMB) temperature anisotropies. Based on the
detail analysis in perturbation equations of dark energy and dark matter when
they a... | [
{
"created": "Wed, 3 Jun 2009 10:00:45 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Aug 2009 14:45:53 GMT",
"version": "v2"
}
] | 2009-11-06 | [
[
"He",
"Jian-Hua",
""
],
[
"Wang",
"Bin",
""
],
[
"Zhang",
"Pengjie",
""
]
] | Dark energy interacting with dark matter is a promising model to solve the cosmic coincidence problem. We study the signature of such interaction on large scale cosmic microwave background (CMB) temperature anisotropies. Based on the detail analysis in perturbation equations of dark energy and dark matter when they are... |
2305.07541 | Ayan Banerjee | Ayan Banerjee, Takol Tangphati and Anirudh Pradhan | Wormholes and energy conditions in $f(R,T)$ gravity | 8 pages, 3 figures, typo fixed; new references added | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the existence of wormholes in the context of $f(R,T)$ gravity. The
$f(R,T)$ theory is a curvature-matter coupled modified gravity that depends on
an arbitrary function of the Ricci scalar $R$ and the trace of the
stress-energy tensor $T$. In this work, we adopt two different choices for the
matter Lagrangi... | [
{
"created": "Fri, 12 May 2023 15:07:32 GMT",
"version": "v1"
},
{
"created": "Tue, 23 May 2023 07:36:04 GMT",
"version": "v2"
}
] | 2023-05-24 | [
[
"Banerjee",
"Ayan",
""
],
[
"Tangphati",
"Takol",
""
],
[
"Pradhan",
"Anirudh",
""
]
] | We explore the existence of wormholes in the context of $f(R,T)$ gravity. The $f(R,T)$ theory is a curvature-matter coupled modified gravity that depends on an arbitrary function of the Ricci scalar $R$ and the trace of the stress-energy tensor $T$. In this work, we adopt two different choices for the matter Lagrangian... |
1009.1838 | Holger M\"uller | Holger Mueller, Achim Peters, and Steven Chu | Reply to: Atom gravimeters and the gravitational redshift | Reply to P. Wolf et al., arXiv:1009.0602 | Nature 467:E2,2010 | 10.1038/nature09341 | null | gr-qc physics.atom-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We stand by our result [H. Mueller et al., Nature 463, 926-929 (2010)]. The
comment [P. Wolf et al., Nature 467, E1 (2010)] revisits an interesting issue
that has been known for decades, the relationship between test of the
universality of free fall and redshift experiments. However, it arrives at its
conclusions by ... | [
{
"created": "Thu, 9 Sep 2010 18:05:49 GMT",
"version": "v1"
}
] | 2010-11-15 | [
[
"Mueller",
"Holger",
""
],
[
"Peters",
"Achim",
""
],
[
"Chu",
"Steven",
""
]
] | We stand by our result [H. Mueller et al., Nature 463, 926-929 (2010)]. The comment [P. Wolf et al., Nature 467, E1 (2010)] revisits an interesting issue that has been known for decades, the relationship between test of the universality of free fall and redshift experiments. However, it arrives at its conclusions by ap... |
2303.11134 | Leihua Liu | Ke Gao, Lei-Hua Liu | Microlensing and event rate of static spherically symmetric wormhole | Significantly improved | null | null | null | gr-qc astro-ph.GA | http://creativecommons.org/licenses/by/4.0/ | Since the lensing effects play a vital role in modern cosmology. A new
framework is developed for the static spherically symmetrical wormhole (WH) in
terms of the radial equation of state (REoS). Following the standard procedure,
we calculate the lensing equation, magnification, and event rate according to
REoS, wher... | [
{
"created": "Mon, 20 Mar 2023 14:11:55 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Jun 2023 12:40:10 GMT",
"version": "v2"
},
{
"created": "Mon, 12 Jun 2023 03:27:21 GMT",
"version": "v3"
},
{
"created": "Mon, 9 Oct 2023 13:36:21 GMT",
"version": "v4"
}
] | 2023-10-10 | [
[
"Gao",
"Ke",
""
],
[
"Liu",
"Lei-Hua",
""
]
] | Since the lensing effects play a vital role in modern cosmology. A new framework is developed for the static spherically symmetrical wormhole (WH) in terms of the radial equation of state (REoS). Following the standard procedure, we calculate the lensing equation, magnification, and event rate according to REoS, where ... |
gr-qc/0304052 | Igor Novikov | Igor D. Novikov | Developments in General Relativity: Black Hole Singularity and Beyond | 13 pages | null | 10.1142/9789812704009_0008 | null | gr-qc | null | At the 20-th Texas Symposium on Relativistic Astrophysics there was a plenary
talk devoted to the recent developments in classical Relativity. In that talk
the problems of gravitational collapse, collisions of black holes, and of black
holes as celestial bodies were discussed. But probably the problems of the
interna... | [
{
"created": "Mon, 14 Apr 2003 12:24:13 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Apr 2003 17:35:14 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"Novikov",
"Igor D.",
""
]
] | At the 20-th Texas Symposium on Relativistic Astrophysics there was a plenary talk devoted to the recent developments in classical Relativity. In that talk the problems of gravitational collapse, collisions of black holes, and of black holes as celestial bodies were discussed. But probably the problems of the internal ... |
gr-qc/0303005 | Pal G. Molnar | Pal G. Molnar and Klaus Elsasser | Uniqueness of the electrostatic solution in Schwarzschild space | 3 pages, no figures, uses revtex4 style files | Phys.Rev.D67:047501,2003 | 10.1103/PhysRevD.67.047501 | null | gr-qc math-ph math.MP | null | In this Brief Report we give the proof that the solution of any static test
charge distribution in Schwarzschild space is unique. In order to give the
proof we derive the first Green's identity written with p-forms on (pseudo)
Riemannian manifolds. Moreover, the proof of uniqueness can be shown for either
any purely ... | [
{
"created": "Sun, 2 Mar 2003 10:22:22 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Molnar",
"Pal G.",
""
],
[
"Elsasser",
"Klaus",
""
]
] | In this Brief Report we give the proof that the solution of any static test charge distribution in Schwarzschild space is unique. In order to give the proof we derive the first Green's identity written with p-forms on (pseudo) Riemannian manifolds. Moreover, the proof of uniqueness can be shown for either any purely el... |
1905.04860 | Yong-Wan Kim | Soon-Tae Hong, Yong-Wan Kim, Young-Jai Park | GEMS embeddings and freely falling temperatures of Schwarzschild(-AdS)
black holes in massive gravity | 15 pages, 7 figures, title changed, references added, version to
appear in PLB. arXiv admin note: text overlap with arXiv:1812.00373 | null | 10.1016/j.physletb.2019.135116 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We globally embed (3+1)-dimensional Schwarzschild and Schwarzschild-AdS black
holes in massive gravity into (5+2)-dimensional flat spacetimes. Making use of
embedding coordinates, we directly obtain the generalized Hawking, Unruh and
freely falling temperatures in a Schwarzschild and Schwarzschild-AdS black hole
due ... | [
{
"created": "Mon, 13 May 2019 05:07:44 GMT",
"version": "v1"
},
{
"created": "Thu, 16 May 2019 07:17:14 GMT",
"version": "v2"
},
{
"created": "Wed, 27 Nov 2019 07:47:53 GMT",
"version": "v3"
}
] | 2019-12-02 | [
[
"Hong",
"Soon-Tae",
""
],
[
"Kim",
"Yong-Wan",
""
],
[
"Park",
"Young-Jai",
""
]
] | We globally embed (3+1)-dimensional Schwarzschild and Schwarzschild-AdS black holes in massive gravity into (5+2)-dimensional flat spacetimes. Making use of embedding coordinates, we directly obtain the generalized Hawking, Unruh and freely falling temperatures in a Schwarzschild and Schwarzschild-AdS black hole due to... |
gr-qc/0309034 | Pantelis Apostolopoulos | Michael Tsamparlis and Pantelis S. Apostolopoulos | Ricci and matter collineations of locally rotationally symmetric
space-times | 21 pages, Latex; to appear in General Relativity and Gravitation | Gen.Rel.Grav. 36 (2004) 47-69 | 10.1023/B:GERG.0000006693.75816.e9 | null | gr-qc | null | A new method is presented for the determination of Ricci Collineations (RC)
and Matter Collineations (MC) of a given spacetime, in the cases where the
Ricci tensor and the energy momentum tensor are non-degenerate and have a
similar form with the metric. This method reduces the problem of finding the
RCs and the MCs ... | [
{
"created": "Fri, 5 Sep 2003 15:34:50 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Tsamparlis",
"Michael",
""
],
[
"Apostolopoulos",
"Pantelis S.",
""
]
] | A new method is presented for the determination of Ricci Collineations (RC) and Matter Collineations (MC) of a given spacetime, in the cases where the Ricci tensor and the energy momentum tensor are non-degenerate and have a similar form with the metric. This method reduces the problem of finding the RCs and the MCs to... |
1810.01948 | Stanley Deser | S. Deser | A note on matter covariantization for gravity coupling | Published version, typos corrected | Gen Relativ Gravit (2019) 51: 18 | 10.1007/s10714-018-2498-6 | BRX-6639; Calt-TH 2018-039 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Covariantization is of course required for initially flat space matter to
couple consistently to GR; here I show in detail for concrete systems how it
follows in the same physical way as that deriving GR itself from its initial
free-field form.
| [
{
"created": "Wed, 3 Oct 2018 20:29:58 GMT",
"version": "v1"
},
{
"created": "Sat, 5 Jan 2019 19:05:37 GMT",
"version": "v2"
}
] | 2019-01-16 | [
[
"Deser",
"S.",
""
]
] | Covariantization is of course required for initially flat space matter to couple consistently to GR; here I show in detail for concrete systems how it follows in the same physical way as that deriving GR itself from its initial free-field form. |
2210.04004 | Thomas Buchert | Ismael Delgado Gaspar, Thomas Buchert, Jan J. Ostrowski | Beyond relativistic Lagrangian perturbation theory. I. An exact-solution
controlled model for structure formation | 21 pages, 4 figures, matches published version in PRD | Phys. Rev. D 107, 024018 (2023) | 10.1103/PhysRevD.107.024018 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We develop a new nonlinear method to model structure formation in general
relativity from a generalization of the relativistic Lagrangian perturbation
schemes, controlled by Szekeres (and LTB) exact solutions. The overall approach
can be interpreted as the evolution of a deformation field on an inhomogeneous
referenc... | [
{
"created": "Sat, 8 Oct 2022 12:01:39 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jan 2023 11:41:02 GMT",
"version": "v2"
}
] | 2023-01-19 | [
[
"Gaspar",
"Ismael Delgado",
""
],
[
"Buchert",
"Thomas",
""
],
[
"Ostrowski",
"Jan J.",
""
]
] | We develop a new nonlinear method to model structure formation in general relativity from a generalization of the relativistic Lagrangian perturbation schemes, controlled by Szekeres (and LTB) exact solutions. The overall approach can be interpreted as the evolution of a deformation field on an inhomogeneous reference ... |
1508.05303 | Giuseppe Papallo | Giuseppe Papallo and Harvey S. Reall | Graviton time delay and a speed limit for small black holes in
Einstein-Gauss-Bonnet theory | v2: Typos corrected. Short argument for time advance added in section
4.4. Added reference. Matches the version to appear in JHEP. 22 pages +
appendices, 15 figures | JHEP 11 (2015) 109 | 10.1007/JHEP11(2015)109 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Camanho, Edelstein, Maldacena and Zhiboedov have shown that gravitons can
experience a negative Shapiro time delay, i.e. a time advance, in
Einstein-Gauss-Bonnet theory. They studied gravitons propagating in singular
"shock-wave" geometries. We study this effect for gravitons propagating in
smooth black hole spacetim... | [
{
"created": "Fri, 21 Aug 2015 15:11:33 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Oct 2015 14:22:05 GMT",
"version": "v2"
}
] | 2015-11-24 | [
[
"Papallo",
"Giuseppe",
""
],
[
"Reall",
"Harvey S.",
""
]
] | Camanho, Edelstein, Maldacena and Zhiboedov have shown that gravitons can experience a negative Shapiro time delay, i.e. a time advance, in Einstein-Gauss-Bonnet theory. They studied gravitons propagating in singular "shock-wave" geometries. We study this effect for gravitons propagating in smooth black hole spacetimes... |
1908.09769 | Babak Vakili | Fatimah Tavakoli and Babak Vakili | Bianchi type I, Schutz perfect fluid and evolutionary quantum cosmology | 14 pages, 2 figures | Gen. Rel. Grav. 51 (2019) 122 | 10.1007/s10714-019-2602-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the classical and quantum cosmology of a universe in which the
matter content is a perfect fluid and the background geometry is described by a
Bianchi type I metric. To write the Hamiltonian of the perfect fluid we use the
Schutz representation, in terms of which, after a particular gauge fixing, we
are led ... | [
{
"created": "Mon, 26 Aug 2019 16:10:40 GMT",
"version": "v1"
}
] | 2019-09-23 | [
[
"Tavakoli",
"Fatimah",
""
],
[
"Vakili",
"Babak",
""
]
] | We study the classical and quantum cosmology of a universe in which the matter content is a perfect fluid and the background geometry is described by a Bianchi type I metric. To write the Hamiltonian of the perfect fluid we use the Schutz representation, in terms of which, after a particular gauge fixing, we are led to... |
1703.03059 | Peter K.F. Kuhfittig | Peter K.F. Kuhfittig and Vance D. Gladney | Noncommutative-geometry inspired charged wormholes with low tidal forces | 8 pages, no figures | Journal of Applied Mathematics and Physics (JAMP), vol. 5, pp.
574-581 (2017) | 10.4236/jamp.2017.53049 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When Morris and Thorne first proposed that wormholes might be actual physical
structures suitable for interstellar travel, they needed to pay close attention
to certain traversability conditions such as low tidal forces, which placed
severe constraints on the wormhole geometry. Even more problematical was the
need fo... | [
{
"created": "Wed, 8 Mar 2017 22:23:16 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Jul 2024 00:24:06 GMT",
"version": "v2"
}
] | 2024-07-15 | [
[
"Kuhfittig",
"Peter K. F.",
""
],
[
"Gladney",
"Vance D.",
""
]
] | When Morris and Thorne first proposed that wormholes might be actual physical structures suitable for interstellar travel, they needed to pay close attention to certain traversability conditions such as low tidal forces, which placed severe constraints on the wormhole geometry. Even more problematical was the need for ... |
1108.0449 | Ariel Edery | Hugues Beauchesne and Ariel Edery | Emergence of thin shell structure during collapse in isotropic
coordinates | 24 pages, 10 figures. version to appear in Phys. Rev. D | Phys. Rev. D 85, 044056 (2012) | 10.1103/PhysRevD.85.044056 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Numerical studies of gravitational collapse in isotropic coordinates have
recently shown an interesting connection between the gravitational Lagrangian
and black hole thermodynamics. A study of the actual spacetime was not the main
focus of this work and in particular, the rich and interesting structure of the
interi... | [
{
"created": "Tue, 2 Aug 2011 00:03:28 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Feb 2012 22:08:51 GMT",
"version": "v2"
}
] | 2012-02-24 | [
[
"Beauchesne",
"Hugues",
""
],
[
"Edery",
"Ariel",
""
]
] | Numerical studies of gravitational collapse in isotropic coordinates have recently shown an interesting connection between the gravitational Lagrangian and black hole thermodynamics. A study of the actual spacetime was not the main focus of this work and in particular, the rich and interesting structure of the interior... |
1707.03284 | Satadal Datta | Satadal Datta | Analogue tachyon in Jeans Cloud | null | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the linear perturbations in a stable Jeans cloud, i.e; the dimension
of the cloud is less than the Jeans length. We find that the linear
perturbation of density in such a system obeys a wave equation in acoustic
analogue of Minkowski space-time which is similar to Klein-Gordon equation for
tachyon field in M... | [
{
"created": "Sun, 9 Jul 2017 14:21:15 GMT",
"version": "v1"
}
] | 2017-07-12 | [
[
"Datta",
"Satadal",
""
]
] | We study the linear perturbations in a stable Jeans cloud, i.e; the dimension of the cloud is less than the Jeans length. We find that the linear perturbation of density in such a system obeys a wave equation in acoustic analogue of Minkowski space-time which is similar to Klein-Gordon equation for tachyon field in Min... |
1904.06914 | Rajani K.V | Rajani K.V., C.L. Ahmed Rizwan, A. Naveena Kumara, Deepak Vaid, Ajith
K.M | Regular Bardeen AdS Black Hole as a Heat Engine | null | Nucl.Phys.B 960 (2020) 115166 | 10.1016/j.nuclphysb.2020.115166 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the thermodynamic phase transitions and heat engine efficiency
in regular Bardeen AdS black hole. Interpreting cosmological constant as
thermodynamic pressure, we study the thermodynamics using T S and P v plots.
Specific heat studies also carried out in detail. A first order phase
transition in eviden... | [
{
"created": "Mon, 15 Apr 2019 09:02:30 GMT",
"version": "v1"
}
] | 2020-09-21 | [
[
"V.",
"Rajani K.",
""
],
[
"Rizwan",
"C. L. Ahmed",
""
],
[
"Kumara",
"A. Naveena",
""
],
[
"Vaid",
"Deepak",
""
],
[
"M",
"Ajith K.",
""
]
] | We investigate the thermodynamic phase transitions and heat engine efficiency in regular Bardeen AdS black hole. Interpreting cosmological constant as thermodynamic pressure, we study the thermodynamics using T S and P v plots. Specific heat studies also carried out in detail. A first order phase transition in evident ... |
1801.09660 | Hussain Gohar | Ana Alonso-Serrano, Mariusz P. Dabrowski, Hussain Gohar | Generalized uncertainty principle impact onto the black holes
information flux and the sparsity of Hawking radiation | 6 pages, 2 figures, typos corrected, published in Phys. Rev. D | Phys. Rev. D 97, 044029 (2018) | 10.1103/PhysRevD.97.044029 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the generalized uncertainty principle (GUP) corrections to the
entropy content and the information flux of black holes, as well as the
corrections to the sparsity of the Hawking radiation at the late stages of
evaporation. We find that due to these quantum gravity motivated corrections,
the entropy flo... | [
{
"created": "Mon, 29 Jan 2018 18:36:26 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Feb 2018 13:56:02 GMT",
"version": "v2"
},
{
"created": "Thu, 22 Feb 2018 16:26:07 GMT",
"version": "v3"
}
] | 2018-02-23 | [
[
"Alonso-Serrano",
"Ana",
""
],
[
"Dabrowski",
"Mariusz P.",
""
],
[
"Gohar",
"Hussain",
""
]
] | We investigate the generalized uncertainty principle (GUP) corrections to the entropy content and the information flux of black holes, as well as the corrections to the sparsity of the Hawking radiation at the late stages of evaporation. We find that due to these quantum gravity motivated corrections, the entropy flow ... |
1407.8237 | Luca Fabbri | Luca Fabbri, Stefano Vignolo | ELKO and Dirac Spinors seen from Torsion | 11 pages | Int.J.Mod.Phys.D23:1444001(2014) | 10.1142/S0218271814440015 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, the recently-introduced ELKO and the well-known Dirac spinor
fields will be compared; however, instead of comparing them under the point of
view of their algebraic properties or their dynamical features, we will proceed
by investigating the analogies and similarities in terms of their geometrical
chara... | [
{
"created": "Wed, 30 Jul 2014 23:40:43 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Sep 2014 16:54:43 GMT",
"version": "v2"
}
] | 2014-09-12 | [
[
"Fabbri",
"Luca",
""
],
[
"Vignolo",
"Stefano",
""
]
] | In this paper, the recently-introduced ELKO and the well-known Dirac spinor fields will be compared; however, instead of comparing them under the point of view of their algebraic properties or their dynamical features, we will proceed by investigating the analogies and similarities in terms of their geometrical charact... |
1712.08031 | Francesco Becattini | F. Becattini (University of Florence and INFN) | Thermodynamic equilibrium with acceleration and the Unruh effect | 15 pages, 2 figures; updated version accepted for publication in
Phys. Rev. D | Phys. Rev. D 97, 085013 (2018) | 10.1103/PhysRevD.97.085013 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We address the problem of thermodynamic equilibrium with constant
acceleration along the velocity field lines in a quantum relativistic
statistical mechanics framework. We show that for a free scalar quantum field,
after vacuum subtraction, all mean values vanish when the local temperature T
is as low as the Unruh te... | [
{
"created": "Thu, 21 Dec 2017 15:54:22 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Mar 2018 12:21:03 GMT",
"version": "v2"
}
] | 2018-04-25 | [
[
"Becattini",
"F.",
"",
"University of Florence and INFN"
]
] | We address the problem of thermodynamic equilibrium with constant acceleration along the velocity field lines in a quantum relativistic statistical mechanics framework. We show that for a free scalar quantum field, after vacuum subtraction, all mean values vanish when the local temperature T is as low as the Unruh temp... |
gr-qc/0203091 | Laszlo A. Gergely | L\'aszl\'o \'A. Gergely, Zolt\'an Perj\'es | Vacuum Kerr-Schild metrics generated by nontwisting congruences | 12 pages | Annalen Phys. 3 (1994) 609-619 | 10.1002/andp.19945060706 | null | gr-qc | null | The Kerr-Schild pencil of metrics $\tilde g_{ab}=g_{ab}+V l_al_b$, with
$g_{ab}$ and $\tilde g_{ab}$ satisfying the vacuum Einstein equations, is
investigated in the case when the null vector $l$ has vanishing twist. This
class of Kerr-Schild metrics contains two solutions: the Kasner metric and a
metric wich can be ... | [
{
"created": "Tue, 26 Mar 2002 12:39:23 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Gergely",
"László Á.",
""
],
[
"Perjés",
"Zoltán",
""
]
] | The Kerr-Schild pencil of metrics $\tilde g_{ab}=g_{ab}+V l_al_b$, with $g_{ab}$ and $\tilde g_{ab}$ satisfying the vacuum Einstein equations, is investigated in the case when the null vector $l$ has vanishing twist. This class of Kerr-Schild metrics contains two solutions: the Kasner metric and a metric wich can be ob... |
gr-qc/9907007 | Ken D. Olum | Ken D. Olum | The Ori-Soen time machine | 5 pages, RevTeX, 7 figures with epsf, miscellaneous clarifications in
v2, minor updates to correspond to version to appear in PRD | Phys.Rev. D61 (2000) 124022 | 10.1103/PhysRevD.61.124022 | null | gr-qc | null | Ori and Soen have proposed a spacetime which has closed causal curves on the
boundary of a region of normal causality, all within a region where the weak
energy condition (positive energy density) is satisfied. I analyze the causal
structure of this spacetime in some simplified models, show that the Cauchy
horizon is... | [
{
"created": "Fri, 2 Jul 1999 21:14:25 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Dec 1999 21:26:51 GMT",
"version": "v2"
},
{
"created": "Tue, 18 Apr 2000 21:41:05 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Olum",
"Ken D.",
""
]
] | Ori and Soen have proposed a spacetime which has closed causal curves on the boundary of a region of normal causality, all within a region where the weak energy condition (positive energy density) is satisfied. I analyze the causal structure of this spacetime in some simplified models, show that the Cauchy horizon is c... |
2201.06683 | Chikun Ding | Chikun Ding, Yu Shi, Jun Chen, Yuebing Zhou and Changqing Liu | High dimensional AdS-like black hole and Phase transition in
Einstein-bumblebee gravity | 19 pages,four figures, 1 table | Chin. Phys. C 47 045102 (2023) | 10.1088/1674-1137/aca8f4 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this paper we obtain an exact high dimensional anti-de Sitter (AdS) black
hole solution in Einstein-bumblebee gravity theory. This AdS-like black hole
can only exist with a linear functional potential of the bumblebee field. We
find that the Smarr formula and the first law of black hole thermodynamics can
still be... | [
{
"created": "Tue, 18 Jan 2022 01:08:43 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Sep 2022 07:34:28 GMT",
"version": "v2"
}
] | 2023-02-27 | [
[
"Ding",
"Chikun",
""
],
[
"Shi",
"Yu",
""
],
[
"Chen",
"Jun",
""
],
[
"Zhou",
"Yuebing",
""
],
[
"Liu",
"Changqing",
""
]
] | In this paper we obtain an exact high dimensional anti-de Sitter (AdS) black hole solution in Einstein-bumblebee gravity theory. This AdS-like black hole can only exist with a linear functional potential of the bumblebee field. We find that the Smarr formula and the first law of black hole thermodynamics can still be c... |
2406.02288 | David Gr\"uber | D. Gr\"uber, P. P. Avelino, L. Sousa | Domain walls in light of Cosmic Microwave Background and Pulsar Timing
Array data | null | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this paper, we study the compatibility of biased domain wall scenarios
with current gravitational wave data. We show that the Cosmic Microwave
Background bounds on the fractional density of gravitational waves at the time
of decoupling may only slightly improve on the constraints that result from
requiring that do... | [
{
"created": "Tue, 4 Jun 2024 13:01:20 GMT",
"version": "v1"
}
] | 2024-06-05 | [
[
"Grüber",
"D.",
""
],
[
"Avelino",
"P. P.",
""
],
[
"Sousa",
"L.",
""
]
] | In this paper, we study the compatibility of biased domain wall scenarios with current gravitational wave data. We show that the Cosmic Microwave Background bounds on the fractional density of gravitational waves at the time of decoupling may only slightly improve on the constraints that result from requiring that doma... |
1408.4839 | Mauricio Bellini | Ricardo Aguila, Jos\'e Edgar Madriz Aguilar, Claudia Moreno (CUCEI,
Guadalajara University), Mauricio Bellini (IFIMAR, CONICET and UNMdP) | Present accelerated expansion of the universe from new Weyl-Integrable
gravity approach | Version to be published in Eur. Phys. J. C | null | 10.1140/epjc/s10052-014-3158-y | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate if a recently introduced formulation of general relativity on
a Weyl-integrable geometry, contains cosmological solutions exhibiting
acceleration in the present cosmic expansion. We derive the general conditions
to have acceleration in the expansion of the universe and obtain a particular
solution for ... | [
{
"created": "Wed, 20 Aug 2014 23:43:47 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Oct 2014 15:03:54 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Nov 2014 15:43:27 GMT",
"version": "v3"
}
] | 2015-06-22 | [
[
"Aguila",
"Ricardo",
"",
"CUCEI,\n Guadalajara University"
],
[
"Aguilar",
"José Edgar Madriz",
"",
"CUCEI,\n Guadalajara University"
],
[
"Moreno",
"Claudia",
"",
"CUCEI,\n Guadalajara University"
],
[
"Bellini",
"Mauricio",
"",
"IFIM... | We investigate if a recently introduced formulation of general relativity on a Weyl-integrable geometry, contains cosmological solutions exhibiting acceleration in the present cosmic expansion. We derive the general conditions to have acceleration in the expansion of the universe and obtain a particular solution for th... |
gr-qc/9510004 | Contreras Gerardo | R. Bertolotti, G. Contreras, L. A. N\'u\~nez, U. Percoco (University
of Los Andes, M\`erida, Venezuela) and J.Carot (Universitat de les Illes
Baleares, Mallorca, Espa\~na) | Comment on Ricci Collineations of Static Spherically Symmetric
Spacetimes | 4 pages,LaTex file | J.Math.Phys. 37 (1996) 1086-1088 | 10.1063/1.531427 | null | gr-qc | null | We present a counter example to a theorem given by Amir {\em et al.} J. Math.
Phys. {\bf 35}, 3005 (1994). We also comment on a misleading statements of the
same reference.
| [
{
"created": "Tue, 3 Oct 1995 20:59:35 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Oct 1995 22:52:42 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Bertolotti",
"R.",
"",
"University\n of Los Andes, Mèrida, Venezuela"
],
[
"Contreras",
"G.",
"",
"University\n of Los Andes, Mèrida, Venezuela"
],
[
"Núñez",
"L. A.",
"",
"University\n of Los Andes, Mèrida, Venezuela"
],
[
"Percoco",
"U.",
... | We present a counter example to a theorem given by Amir {\em et al.} J. Math. Phys. {\bf 35}, 3005 (1994). We also comment on a misleading statements of the same reference. |
0710.5619 | Saibal Ray | Sumana Bhadra | Electromagnetic Mass Models in General Theory of Relativity | 100 pages, Ph.D. thesis | null | null | null | gr-qc | null | "Electromagnetic mass" where gravitational mass and other physical quantities
originate from the electromagnetic field alone has a century long distinguished
history. In the introductory chapter we have divided this history into three
broad categories -- classical, quantum mechanical and general relativistic.
Each of... | [
{
"created": "Tue, 30 Oct 2007 11:55:21 GMT",
"version": "v1"
}
] | 2007-10-31 | [
[
"Bhadra",
"Sumana",
""
]
] | "Electromagnetic mass" where gravitational mass and other physical quantities originate from the electromagnetic field alone has a century long distinguished history. In the introductory chapter we have divided this history into three broad categories -- classical, quantum mechanical and general relativistic. Each of t... |
gr-qc/9707060 | Torsten Tok | Gerd Rudolph and Torsten Tok and Igor P. Volobuev | Exact solutions in Einstein-Yang-Mills-Dirac systems | 18 pages, LaTeX 2e | J.Math.Phys. 40 (1999) 5890-5904 | 10.1063/1.533061 | null | gr-qc | null | We present exact solutions in Einstein-Yang-Mills-Dirac theories with gauge
groups SU(2) and SU(4) in Robertson-Walker space-time $R \times S^3 $, which
are symmetric under the action of the group SO(4) of spatial rotations. Our
approach is based on the dimensional reduction method for gauge and
gravitational fields ... | [
{
"created": "Wed, 30 Jul 1997 12:51:04 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Rudolph",
"Gerd",
""
],
[
"Tok",
"Torsten",
""
],
[
"Volobuev",
"Igor P.",
""
]
] | We present exact solutions in Einstein-Yang-Mills-Dirac theories with gauge groups SU(2) and SU(4) in Robertson-Walker space-time $R \times S^3 $, which are symmetric under the action of the group SO(4) of spatial rotations. Our approach is based on the dimensional reduction method for gauge and gravitational fields an... |
1207.6370 | Enrico Barausse | Enrico Barausse and Thomas P. Sotiriou | A no-go theorem for slowly rotating black holes in Horava-Lifshitz
gravity | 5 pages, 1 figure. Very minor changes to text (results unchanged) to
match version accepted for publication in Phys. Rev. Lett | Phys. Rev. Lett. 109, 181101 (2012), Erratum Phys. Rev. Lett. 110,
039902(E) (2013) | 10.1103/PhysRevLett.109.181101 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider slowly rotating, stationary, axisymmetric black holes in the
infrared limit of Horava-Lifshitz gravity. We show that such solutions do not
exist, provided that they are regular everywhere apart from the central
singularity. This has profound implications for the viability of the theory,
considering the as... | [
{
"created": "Thu, 26 Jul 2012 19:03:01 GMT",
"version": "v1"
},
{
"created": "Sat, 29 Sep 2012 20:46:14 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Dec 2012 15:04:56 GMT",
"version": "v3"
}
] | 2013-04-29 | [
[
"Barausse",
"Enrico",
""
],
[
"Sotiriou",
"Thomas P.",
""
]
] | We consider slowly rotating, stationary, axisymmetric black holes in the infrared limit of Horava-Lifshitz gravity. We show that such solutions do not exist, provided that they are regular everywhere apart from the central singularity. This has profound implications for the viability of the theory, considering the astr... |
1110.0813 | Dieter Luest | Dieter Lust, Marios Petropoulos | Comment on superluminality in general relativity | 6 pages | null | 10.1088/0264-9381/29/8/085013 | CPHT-RR066.0911, MPP-2011-115, LMU-ASC 45/11 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | General relativity provides an appropriate framework for addressing the issue
of sub- or superluminality as an apparent effect. Even though a massless
particle travels on the light cone, its average velocity over a finite path
measured by different observers is not necessarily equal to the velocity of
light, as a con... | [
{
"created": "Tue, 4 Oct 2011 19:25:29 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Lust",
"Dieter",
""
],
[
"Petropoulos",
"Marios",
""
]
] | General relativity provides an appropriate framework for addressing the issue of sub- or superluminality as an apparent effect. Even though a massless particle travels on the light cone, its average velocity over a finite path measured by different observers is not necessarily equal to the velocity of light, as a conse... |
1909.09519 | John Barrow | John D. Barrow | Sudden Singularities in Brans-Dicke Cosmology and its Generalisations | 7 pages, no figures | Class. Quantum Grav. 37, 065014 (2020) | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that cosmological sudden singularities that respect the energy
conditions can occur at finite times in Brans-Dicke and more general
scalar-tensor theories of gravity. We construct these explicitly in the
Friedmann universes. Higher-order versions of these singularities are also
possible, including those that ... | [
{
"created": "Fri, 20 Sep 2019 14:10:05 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Jan 2020 12:00:30 GMT",
"version": "v2"
}
] | 2020-02-21 | [
[
"Barrow",
"John D.",
""
]
] | We show that cosmological sudden singularities that respect the energy conditions can occur at finite times in Brans-Dicke and more general scalar-tensor theories of gravity. We construct these explicitly in the Friedmann universes. Higher-order versions of these singularities are also possible, including those that ar... |
2111.14214 | Lucrezia Ravera | Damianos Iosifidis, Ratbay Myrzakulov, Lucrezia Ravera, Gulmira
Yergaliyeva, Koblandy Yerzhanov | Metric-Affine Vector-Tensor Correspondence and Implications in
$F(R,T,Q,\mathcal{T},\mathcal{D})$ gravity | 28 pages | Phys. Dark Univ. 37 (2022), 101094 | 10.1016/j.dark.2022.101094 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the results of antecedent literature on quadratic Metric-Affine
Gravity by studying a new quadratic gravity action in vacuum which, besides the
usual (non-Riemannian) Einstein-Hilbert contribution, involves all the parity
even quadratic terms in torsion and non-metricity plus a Lagrangian that is
quadratic ... | [
{
"created": "Sun, 28 Nov 2021 19:11:56 GMT",
"version": "v1"
}
] | 2022-12-26 | [
[
"Iosifidis",
"Damianos",
""
],
[
"Myrzakulov",
"Ratbay",
""
],
[
"Ravera",
"Lucrezia",
""
],
[
"Yergaliyeva",
"Gulmira",
""
],
[
"Yerzhanov",
"Koblandy",
""
]
] | We extend the results of antecedent literature on quadratic Metric-Affine Gravity by studying a new quadratic gravity action in vacuum which, besides the usual (non-Riemannian) Einstein-Hilbert contribution, involves all the parity even quadratic terms in torsion and non-metricity plus a Lagrangian that is quadratic in... |
2407.20688 | Marco Schreck MS | Jo\~ao Victor V. Santos and Marco Schreck | Hamiltonian formulation for scalar model of spontaneous spacetime
symmetry violation in gravity | 48 pages, 2 figures, 2 tables | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The focus of this article is on a modification of General Relativity (GR)
governed by a dynamical scalar field. The latter is able to acquire a nonzero
spacetime-dependent vacuum expectation value, which gives rise to a spontaneous
violation of spacetime symmetries. Based on the (3+1) decomposition, we
demonstrate ho... | [
{
"created": "Tue, 30 Jul 2024 09:29:36 GMT",
"version": "v1"
}
] | 2024-07-31 | [
[
"Santos",
"João Victor V.",
""
],
[
"Schreck",
"Marco",
""
]
] | The focus of this article is on a modification of General Relativity (GR) governed by a dynamical scalar field. The latter is able to acquire a nonzero spacetime-dependent vacuum expectation value, which gives rise to a spontaneous violation of spacetime symmetries. Based on the (3+1) decomposition, we demonstrate how ... |
1011.0557 | Farhad Darabi | F. Darabi and S. Jalalzadeh | One-loop quantum cosmological correction to the gravitational constant
using the kink solution in de Sitter universe | 18 pages | Mod.Phys.Lett.A25:2955-2971,2010 | 10.1142/S0217732310033943 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we show the equivalence between a classical static scalar
field theory and the (closed) de Sitter cosmological model whose potential
represents shape invariance property. Based on this equivalence, we calculate
the one-loop quantum cosmological correction to the ground state energy of the
kink-like sol... | [
{
"created": "Tue, 2 Nov 2010 09:58:01 GMT",
"version": "v1"
}
] | 2011-06-06 | [
[
"Darabi",
"F.",
""
],
[
"Jalalzadeh",
"S.",
""
]
] | In this paper, we show the equivalence between a classical static scalar field theory and the (closed) de Sitter cosmological model whose potential represents shape invariance property. Based on this equivalence, we calculate the one-loop quantum cosmological correction to the ground state energy of the kink-like solut... |
1508.07507 | Stanley P. Gudder | Stan Gudder | Wave Equations for Discrete Quantum Gravity | 17 pages, no figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article is based on the covariant causal set ($c$-causet) approach to
discrete quantum gravity. A $c$-causet $x$ is a finite partially ordered set
that has a unique labeling of its vertices. A rate of change on $x$ is
described by a covariant difference operator and this operator acting on a wave
function forms ... | [
{
"created": "Sat, 29 Aug 2015 21:48:17 GMT",
"version": "v1"
}
] | 2015-09-01 | [
[
"Gudder",
"Stan",
""
]
] | This article is based on the covariant causal set ($c$-causet) approach to discrete quantum gravity. A $c$-causet $x$ is a finite partially ordered set that has a unique labeling of its vertices. A rate of change on $x$ is described by a covariant difference operator and this operator acting on a wave function forms th... |
gr-qc/9310007 | Harald H. Soleng | H. H. Soleng | Inverse Square Law of Gravitation in (2+1)-Dimensional Space-Time as a
Consequence of Casimir Energy | 10 pages, LaTeX, Report: UPR-0540-T, To appear in Physica Scripta | Phys.Scripta 48:649-652,1993 | 10.1088/0031-8949/48/6/002 | null | gr-qc | null | The gravitational effect of vacuum polarization in space exterior to a
particle in (2+1)-dimensional Einstein theory is investigated. In the weak
field limit this gravitational field corresponds to an inverse square law of
gravitational attraction, even though the gravitational mass of the quantum
vacuum is negative.... | [
{
"created": "Mon, 4 Oct 1993 12:18:04 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Soleng",
"H. H.",
""
]
] | The gravitational effect of vacuum polarization in space exterior to a particle in (2+1)-dimensional Einstein theory is investigated. In the weak field limit this gravitational field corresponds to an inverse square law of gravitational attraction, even though the gravitational mass of the quantum vacuum is negative. T... |
2407.11860 | Adam S. Wilkinson | Adam S. Wilkinson, Jorma Louko | Local quantum detection of cosmological expansion: Unruh-DeWitt in
spatially compact Milne | 17 pages, 7 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse the excitations and de-excitations of an inertial Unruh-DeWitt
detector in the $(1+1)$-dimensional expanding Milne cosmology with compact
spatial sections, coupled to a real massless scalar field with either untwisted
or twisted boundary conditions, prepared in the conformal vacuum. We find the
detector's ... | [
{
"created": "Tue, 16 Jul 2024 15:47:35 GMT",
"version": "v1"
}
] | 2024-07-17 | [
[
"Wilkinson",
"Adam S.",
""
],
[
"Louko",
"Jorma",
""
]
] | We analyse the excitations and de-excitations of an inertial Unruh-DeWitt detector in the $(1+1)$-dimensional expanding Milne cosmology with compact spatial sections, coupled to a real massless scalar field with either untwisted or twisted boundary conditions, prepared in the conformal vacuum. We find the detector's re... |
0710.2915 | Lior M. Burko | Carl J. Blaksley and Lior M. Burko | The late-time tails in the Reissner-Nordstr\"{o}m spacetime revisited | 11 pages, 13 figues, 1 table. Submitted to Phys. Rev. D | Phys.Rev.D76:104035,2007 | 10.1103/PhysRevD.76.104035 | null | gr-qc | null | We propose that the late-time tail problem in the Reissner-Nordstr\"{o}m (RN)
spacetime is dual to a tail problem in the Schwarzschild spacetime with a
different initial data set: at a fixed observation point the asymptotic decay
rate of the fields are equal. This duality is used to find the decay rate for
tails in R... | [
{
"created": "Mon, 15 Oct 2007 21:11:54 GMT",
"version": "v1"
}
] | 2014-01-14 | [
[
"Blaksley",
"Carl J.",
""
],
[
"Burko",
"Lior M.",
""
]
] | We propose that the late-time tail problem in the Reissner-Nordstr\"{o}m (RN) spacetime is dual to a tail problem in the Schwarzschild spacetime with a different initial data set: at a fixed observation point the asymptotic decay rate of the fields are equal. This duality is used to find the decay rate for tails in RN.... |
1512.01352 | David Vocke | Francesco Marino, Calum Maitland, David Vocke, Antonello Ortolan,
Daniele Faccio | Emergent geometries and nonlinear-wave dynamics in photon fluids | null | null | null | null | gr-qc physics.flu-dyn physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Nonlinear waves in defocusing media are investigated in the framework of the
hydrodynamic description of light as a photon fluid. The observations are
interpreted in terms of an emergent curved spacetime generated by the waves
themselves, which fully determines their dynamics. The spacetime geometry
emerges naturally... | [
{
"created": "Fri, 4 Dec 2015 09:45:48 GMT",
"version": "v1"
}
] | 2015-12-07 | [
[
"Marino",
"Francesco",
""
],
[
"Maitland",
"Calum",
""
],
[
"Vocke",
"David",
""
],
[
"Ortolan",
"Antonello",
""
],
[
"Faccio",
"Daniele",
""
]
] | Nonlinear waves in defocusing media are investigated in the framework of the hydrodynamic description of light as a photon fluid. The observations are interpreted in terms of an emergent curved spacetime generated by the waves themselves, which fully determines their dynamics. The spacetime geometry emerges naturally a... |
1912.04275 | S. Danial Forghani | S. Danial Forghani, S. Habib Mazharimousavi, and Mustafa Halilsoy | Thin-Shell Wormhole Satisfying Energy Conditions | 5 pages, 1 figure (including 6 subfigures) | null | 10.1016/j.physletb.2020.135374 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quartic self-interacting conformal scalar field is used to construct a
thin-shell wormhole satisfying all energy conditions. Accompanying the scalar
field is the extremal Reissner-Nordstr\"om black hole with a positive
cosmological constant. New junction conditions apt for the higher-order terms
are introduced in... | [
{
"created": "Sun, 8 Dec 2019 08:31:47 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Feb 2020 14:42:04 GMT",
"version": "v2"
}
] | 2020-03-31 | [
[
"Forghani",
"S. Danial",
""
],
[
"Mazharimousavi",
"S. Habib",
""
],
[
"Halilsoy",
"Mustafa",
""
]
] | The quartic self-interacting conformal scalar field is used to construct a thin-shell wormhole satisfying all energy conditions. Accompanying the scalar field is the extremal Reissner-Nordstr\"om black hole with a positive cosmological constant. New junction conditions apt for the higher-order terms are introduced in t... |
1308.1076 | Alcides Garat | Alcides Garat | The equivalence between local inertial frames and electromagnetic gauge
in Einstein-Maxwell theories | 10 pages. arXiv admin note: substantial text overlap with
arXiv:1306.2174, arXiv:1306.0602, arXiv:1306.5784, arXiv:1306.4005 | International Journal of Geometric Methods in Modern Physics Vol.
21, No. 03, 2450056 (2024) | 10.1142/S0219887824500567 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We are going to prove that locally the inertial frames and gauge states of
the electromagnetic field are equivalent. This proof will be valid for
Einstein-Maxwell theories in four-dimensional Lorentzian spacetimes. Use will
be made of theorems proved in a previous manuscript. These theorems state that
locally the gro... | [
{
"created": "Mon, 5 Aug 2013 19:17:24 GMT",
"version": "v1"
}
] | 2024-07-16 | [
[
"Garat",
"Alcides",
""
]
] | We are going to prove that locally the inertial frames and gauge states of the electromagnetic field are equivalent. This proof will be valid for Einstein-Maxwell theories in four-dimensional Lorentzian spacetimes. Use will be made of theorems proved in a previous manuscript. These theorems state that locally the group... |
0808.1339 | Ignazio Licata | Ignazio Licata, Leonardo Chiatti | The Archaic Universe: Big Bang, Cosmological Term and the Quantum Origin
of Time in Projective Cosmology | 17 pgs | Int.J.Theor.Phys.48:1003-1018,2009 | 10.1007/s10773-008-9874-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article proposes some cosmological reflections at the qualitative and
conjectural level, suggested by the Fantappie & Arcidiacono projective
relativity theory. The difference will firstly be discussed between two types
of singularity in this theory: geometric (de Sitter horizon) and physical (big
bang, big crunc... | [
{
"created": "Sat, 9 Aug 2008 08:39:58 GMT",
"version": "v1"
}
] | 2009-03-24 | [
[
"Licata",
"Ignazio",
""
],
[
"Chiatti",
"Leonardo",
""
]
] | This article proposes some cosmological reflections at the qualitative and conjectural level, suggested by the Fantappie & Arcidiacono projective relativity theory. The difference will firstly be discussed between two types of singularity in this theory: geometric (de Sitter horizon) and physical (big bang, big crunch)... |
1611.07854 | Francisco Fabi\'an Gonz\'alez | Francisco Fabi\'an Gonz\'alez, Tomislav Prokopec | Renormalization group approach to scalar quantum electrodynamics on de
Sitter | 12 pages, 16 figures | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the quantum loop effects in scalar electrodynamics on de Sitter
space by making use of the functional renormalization group approach. We first
integrate out the photon field, which can be done exactly to leading (zeroth)
order in the gradients of the scalar field, thereby making this method suitable
for i... | [
{
"created": "Wed, 23 Nov 2016 16:11:14 GMT",
"version": "v1"
}
] | 2016-11-24 | [
[
"González",
"Francisco Fabián",
""
],
[
"Prokopec",
"Tomislav",
""
]
] | We consider the quantum loop effects in scalar electrodynamics on de Sitter space by making use of the functional renormalization group approach. We first integrate out the photon field, which can be done exactly to leading (zeroth) order in the gradients of the scalar field, thereby making this method suitable for inv... |
2008.07446 | Branislav Nikolic | Branislav Nikolic | Quantum Geometrodynamics of Higher Derivative Theories with and without
Conformal Symmetry | Doctoral dissertation (University of Cologne), 273 pages, Identical
to the final published version except for minor formatting improvements and
corrected typos | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The main goal of this thesis is to quantize the Einstein-Hilbert action
extended by the quadratic curvature terms within the canonical quantization
approach, thus formulating quantum geometrodynamics of the higher derivative
theories. The motivation is to provide an alternative to the standard canonical
quantization ... | [
{
"created": "Mon, 17 Aug 2020 16:07:29 GMT",
"version": "v1"
}
] | 2020-08-18 | [
[
"Nikolic",
"Branislav",
""
]
] | The main goal of this thesis is to quantize the Einstein-Hilbert action extended by the quadratic curvature terms within the canonical quantization approach, thus formulating quantum geometrodynamics of the higher derivative theories. The motivation is to provide an alternative to the standard canonical quantization ba... |
gr-qc/0605091 | Karel Van Acoleyen | I. Navarro and K. Van Acoleyen | Long distance modifications of gravity in four dimensions | 4 pages, contribution to the proceedings of the Rencontres de
Moriond: Contents and Structures of the Universe, March 18-25, 2006, La
Thuile | null | null | DAMTP-2006-41, DCPT/06/62, IPPP/06/31 | gr-qc | null | We discuss some general characteristics of modifications of the 4D
Einstein-Hilbert action that become important for low space-time curvatures. In
particular we focus on the chameleon-like behaviour of the massive
gravitational degrees of freedom. Generically there is at least one extra
scalar that is light on cosmic... | [
{
"created": "Tue, 16 May 2006 19:48:31 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Navarro",
"I.",
""
],
[
"Van Acoleyen",
"K.",
""
]
] | We discuss some general characteristics of modifications of the 4D Einstein-Hilbert action that become important for low space-time curvatures. In particular we focus on the chameleon-like behaviour of the massive gravitational degrees of freedom. Generically there is at least one extra scalar that is light on cosmic s... |
1508.01810 | Istvan Racz | Istv\'an R\'acz | Constraints as evolutionary systems | 18 pages; exposition improved concerning the algebraic hyperbolic
system; references added; to appear in CQG | Class. Quantum Grav. 33 015014 (2016) | 10.1088/0264-9381/33/1/015014 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The constraint equations for smooth $[n+1]$-dimensional (with $n\geq 3$)
Riemannian or Lorentzian spaces satisfying the Einstein field equations are
considered. It is shown, regardless of the signature of the primary space, that
the constraints can be put into the form of an evolutionary system comprised
either by a ... | [
{
"created": "Fri, 7 Aug 2015 20:39:04 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Sep 2015 21:12:31 GMT",
"version": "v2"
},
{
"created": "Fri, 4 Dec 2015 11:20:38 GMT",
"version": "v3"
}
] | 2015-12-15 | [
[
"Rácz",
"István",
""
]
] | The constraint equations for smooth $[n+1]$-dimensional (with $n\geq 3$) Riemannian or Lorentzian spaces satisfying the Einstein field equations are considered. It is shown, regardless of the signature of the primary space, that the constraints can be put into the form of an evolutionary system comprised either by a fi... |
0711.0090 | Kirill Krasnov | Kirill Krasnov | On deformations of Ashtekar's constraint algebra | 3 pages, no figures | Phys.Rev.Lett.100:081102,2008 | 10.1103/PhysRevLett.100.081102 | null | gr-qc astro-ph hep-th | null | We show that the constraint algebra of Ashtekar's Hamiltonian formulation of
general relativity can be non-trivially deformed by allowing the cosmological
constant to become an arbitrary function of the (Weyl) curvature. Our result
implies that there is not one but infinitely many (parameterized by an
arbitrary funct... | [
{
"created": "Thu, 1 Nov 2007 09:20:27 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Krasnov",
"Kirill",
""
]
] | We show that the constraint algebra of Ashtekar's Hamiltonian formulation of general relativity can be non-trivially deformed by allowing the cosmological constant to become an arbitrary function of the (Weyl) curvature. Our result implies that there is not one but infinitely many (parameterized by an arbitrary functio... |
gr-qc/0211034 | Alexander A. Chernitskii | Alexander A. Chernitskii | Induced gravitation as nonlinear electrodynamics effect | 4 pages, talk given at the V International Conference on
COSMOPARTICLE PHYSICS (Cosmion-2001) Dedicated to 80-th Anniversary of Andrei
D. Sakharov (21-30 May 2001, Moscow-St.Petersburg, Russia) | Grav.Cosmol.Suppl.8N1:157-160,2002 | null | null | gr-qc | null | The effect of induced Riemann geometry in nonlinear electrodynamics is
considered. The possibility for description of real gravitation by this effect
is discussed.
| [
{
"created": "Mon, 11 Nov 2002 11:24:13 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Chernitskii",
"Alexander A.",
""
]
] | The effect of induced Riemann geometry in nonlinear electrodynamics is considered. The possibility for description of real gravitation by this effect is discussed. |
1807.00890 | Serguei Krasnikov | S. Krasnikov | Schwarzschild-Like Wormholes as Accelerators | A few corrections, and clarifications. 2 graphs are added | Phys. Rev. D 98, 104048 (2018) | 10.1103/PhysRevD.98.104048 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a stationary spacetime $S$ consider a pair of free falling particles that
collide with the energy $E_{\rm c.m.}$ (as measured in the center-of-mass
system). Let the metric of $S$ or/and the trajectories of the particles depend
on a parameter $ k$. Then $S$ is said to be a "(super) accelerator" if $E_{\rm
c.m.}$ gr... | [
{
"created": "Mon, 2 Jul 2018 21:11:34 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Nov 2018 18:41:18 GMT",
"version": "v2"
}
] | 2018-12-05 | [
[
"Krasnikov",
"S.",
""
]
] | In a stationary spacetime $S$ consider a pair of free falling particles that collide with the energy $E_{\rm c.m.}$ (as measured in the center-of-mass system). Let the metric of $S$ or/and the trajectories of the particles depend on a parameter $ k$. Then $S$ is said to be a "(super) accelerator" if $E_{\rm c.m.}$ grow... |
1502.04320 | Daniel Coumbe | D.N. Coumbe | Hypothesis on the Nature of Time | 15 pages, 4 figures. Conforms with version to be published in PRD.
Clarifications and references added | null | 10.1103/PhysRevD.91.124040 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present numerical evidence that fictitious diffusing particles in the
causal dynamical triangulation (CDT) approach to quantum gravity exceed the
speed of light on small distance scales. We argue this superluminal behaviour
is responsible for the appearance of dimensional reduction in the spectral
dimension. By ax... | [
{
"created": "Sun, 15 Feb 2015 15:05:30 GMT",
"version": "v1"
},
{
"created": "Fri, 1 May 2015 16:30:23 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Jun 2015 09:20:06 GMT",
"version": "v3"
}
] | 2015-09-14 | [
[
"Coumbe",
"D. N.",
""
]
] | We present numerical evidence that fictitious diffusing particles in the causal dynamical triangulation (CDT) approach to quantum gravity exceed the speed of light on small distance scales. We argue this superluminal behaviour is responsible for the appearance of dimensional reduction in the spectral dimension. By axio... |
2302.02938 | Roberto Maluf | F. M. Belchior, A. R. P. Moreira, R. V. Maluf and C. A. S. Almeida | Localization of abelian gauge fields with Stueckelberg-like geometrical
coupling on $f(T,B)$-thick brane | 28 pages, 7 captioned figures, references added, Enhanced version to
appear in European Physical Journal C | Eur. Phys. J. C 83, 388 (2023) | 10.1140/epjc/s10052-023-11567-y | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In the context of $f(T,B)$ modified teleparallel gravity, we investigate the
influence of torsion scalar $T$ and boundary term $B$ on the confinement of
both the gauge vector and Kalb-Ramond fields. Both fields require a suitable
coupling in five-dimensional braneworld scenarios to yield a normalizable zero
mode. We ... | [
{
"created": "Mon, 6 Feb 2023 17:12:15 GMT",
"version": "v1"
},
{
"created": "Tue, 2 May 2023 06:49:20 GMT",
"version": "v2"
}
] | 2023-05-12 | [
[
"Belchior",
"F. M.",
""
],
[
"Moreira",
"A. R. P.",
""
],
[
"Maluf",
"R. V.",
""
],
[
"Almeida",
"C. A. S.",
""
]
] | In the context of $f(T,B)$ modified teleparallel gravity, we investigate the influence of torsion scalar $T$ and boundary term $B$ on the confinement of both the gauge vector and Kalb-Ramond fields. Both fields require a suitable coupling in five-dimensional braneworld scenarios to yield a normalizable zero mode. We pr... |
1606.01330 | Sumanta Chakraborty | Naresh Dadhich and Sumanta Chakraborty | Buchdahl compactness limit for a pure Lovelock static fluid star | Revised; Title Changed; 11 pages; no figures | Phys. Rev. D 95, 064059 (2017) | 10.1103/PhysRevD.95.064059 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain the Buchdahl compactness limit for a pure Lovelock static fluid
star and verify that the limit following from the uniform density
Schwarzschild's interior solution, which is universal irrespective of the
gravitational theory (Einstein or Lovelock), is true in general. In terms of
surface potential $\Phi(r)$... | [
{
"created": "Sat, 4 Jun 2016 06:01:10 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Nov 2016 07:08:28 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Apr 2017 04:52:30 GMT",
"version": "v3"
},
{
"created": "Mon, 5 Jun 2017 09:33:53 GMT",
"version": "v4"
}
] | 2017-06-06 | [
[
"Dadhich",
"Naresh",
""
],
[
"Chakraborty",
"Sumanta",
""
]
] | We obtain the Buchdahl compactness limit for a pure Lovelock static fluid star and verify that the limit following from the uniform density Schwarzschild's interior solution, which is universal irrespective of the gravitational theory (Einstein or Lovelock), is true in general. In terms of surface potential $\Phi(r)$, ... |
gr-qc/9611069 | Juan Ayon | Eloy Ay\'on-Beato (Depto. Fisica, CINVESTAV-IPN, Mexico) | No-Hair Theorem for Spontaneously Broken Abelian Models in Static Black
Holes | 8 pages, 2 figures, RevTeX; some changes to match published version | Phys.Rev. D62 (2000) 104004 | 10.1103/PhysRevD.62.104004 | null | gr-qc hep-th | null | The vanishing of the electromagnetic field, for purely electric
configurations of spontaneously broken Abelian models, is established in the
domain of outer communications of a static asymptotically flat black hole. The
proof is gauge invariant, and is accomplished without any dependence on the
model. In the particul... | [
{
"created": "Thu, 28 Nov 1996 23:24:38 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jul 2000 20:58:52 GMT",
"version": "v2"
},
{
"created": "Tue, 17 Oct 2000 17:58:15 GMT",
"version": "v3"
}
] | 2009-10-28 | [
[
"Ayón-Beato",
"Eloy",
"",
"Depto. Fisica, CINVESTAV-IPN, Mexico"
]
] | The vanishing of the electromagnetic field, for purely electric configurations of spontaneously broken Abelian models, is established in the domain of outer communications of a static asymptotically flat black hole. The proof is gauge invariant, and is accomplished without any dependence on the model. In the particular... |
gr-qc/0410116 | Nelson Pinto-Neto | Nelson Pinto-Neto and Paulo I. Trajtenberg | The Hamiltonian of Asymptotically Friedmann-Lemaitre-Robertson-Walker
Spacetimes | 12 pages, no figures | Gen.Rel.Grav. 36 (2004) 1871 | 10.1023/B:GERG.0000035956.87421.b6 | null | gr-qc | null | We obtain the correct hamiltonian which describes the dynamics of classes of
asymptotic open Friedmann-Lema\^{\i}tre-Robertson-Walker (FLRW) spacetimes,
which includes Tolman geometries. We calculate the surface term that has to be
added to the usual hamiltonian of General Relativity in order to obtain an
improved ha... | [
{
"created": "Fri, 22 Oct 2004 19:44:07 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Pinto-Neto",
"Nelson",
""
],
[
"Trajtenberg",
"Paulo I.",
""
]
] | We obtain the correct hamiltonian which describes the dynamics of classes of asymptotic open Friedmann-Lema\^{\i}tre-Robertson-Walker (FLRW) spacetimes, which includes Tolman geometries. We calculate the surface term that has to be added to the usual hamiltonian of General Relativity in order to obtain an improved hami... |
1311.0389 | Ikjyot Singh Kohli | Ikjyot Singh Kohli and Michael C. Haslam | On The Dynamics of a Closed Viscous Universe | null | PhysRevD.89.043518 (2014) | 10.1103/PhysRevD.89.043518 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use a dynamical systems approach based on the method of orthonormal frames
to study the dynamics of a non-tilted Bianchi Type IX cosmological model with a
bulk and shear viscous fluid source. We begin by completing a detailed
fix-point analysis which give the local sinks, sources and saddles of the
dynamical syste... | [
{
"created": "Sat, 2 Nov 2013 16:25:27 GMT",
"version": "v1"
},
{
"created": "Sun, 10 Nov 2013 18:17:13 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Nov 2013 17:15:47 GMT",
"version": "v3"
},
{
"created": "Mon, 24 Feb 2014 21:46:22 GMT",
"version": "v4"
},
{
"cr... | 2014-04-03 | [
[
"Kohli",
"Ikjyot Singh",
""
],
[
"Haslam",
"Michael C.",
""
]
] | We use a dynamical systems approach based on the method of orthonormal frames to study the dynamics of a non-tilted Bianchi Type IX cosmological model with a bulk and shear viscous fluid source. We begin by completing a detailed fix-point analysis which give the local sinks, sources and saddles of the dynamical system.... |
2303.04868 | Simen Braeck | S. Braeck | Inertial Frame Dragging and Relative Rotation of ZAMOs in Axistationary
Asymptotically Flat Spacetimes | 11 pages, 3 figures. This paper is a contribution to the Special
Issue of Universe "Entropy, Cosmic Inflation and the Theory of Relativity: In
Honour of Prof. {\O}yvind Gr{\o}n" | Universe 9, 120 (2023) | 10.3390/universe9030120 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In axistationary asymptotically flat spacetimes zero angular momentum
observers (ZAMOs) define an absolute standard of non--rotation locally, as can
be verified by the absence of any Sagnac effect for these observers.
Nevertheless, we argue that on a global scale the only physically meaningful
concept is that of rela... | [
{
"created": "Wed, 8 Mar 2023 20:20:42 GMT",
"version": "v1"
}
] | 2023-03-10 | [
[
"Braeck",
"S.",
""
]
] | In axistationary asymptotically flat spacetimes zero angular momentum observers (ZAMOs) define an absolute standard of non--rotation locally, as can be verified by the absence of any Sagnac effect for these observers. Nevertheless, we argue that on a global scale the only physically meaningful concept is that of relati... |
gr-qc/0405058 | \'Etienne Racine | \'Etienne Racine | Spin and energy evolution equations for a wide class of extended bodies | 17 pages, no figure; substantial changes to presentation, cleaner
computational method and a reference added; version published in Class.
Quantum Grav | Class.Quant.Grav. 23 (2006) 373-390 | 10.1088/0264-9381/23/2/007 | null | gr-qc | null | We give a surface integral derivation of the leading-order evolution
equations for the spin and energy of a relativistic body interacting with other
bodies in the post-Newtonian expansion scheme. The bodies can be arbitrarily
shaped and can be strongly self-gravitating. The effects of all mass and
current multipoles ... | [
{
"created": "Tue, 11 May 2004 18:41:57 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Dec 2005 21:53:39 GMT",
"version": "v2"
}
] | 2016-08-16 | [
[
"Racine",
"Étienne",
""
]
] | We give a surface integral derivation of the leading-order evolution equations for the spin and energy of a relativistic body interacting with other bodies in the post-Newtonian expansion scheme. The bodies can be arbitrarily shaped and can be strongly self-gravitating. The effects of all mass and current multipoles ar... |
gr-qc/9504014 | Peter Peldan | Peter Peldan (Penn State University) | A Modular Invariant Quantum Theory From the Connection Formulation of
(2+1)-Gravity on the Torus | Latex, 4 pages | Class.Quant.Grav. 13 (1996) 221-224 | 10.1088/0264-9381/13/2/010 | CGPG-95/4-2 | gr-qc hep-th | null | By choosing an unconventional polarization of the connection phase space in
(2+1)-gravity on the torus, a modular invariant quantum theory is constructed.
Unitary equivalence to the ADM-quantization is shown.
| [
{
"created": "Mon, 10 Apr 1995 17:31:11 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Peldan",
"Peter",
"",
"Penn State University"
]
] | By choosing an unconventional polarization of the connection phase space in (2+1)-gravity on the torus, a modular invariant quantum theory is constructed. Unitary equivalence to the ADM-quantization is shown. |
0804.4784 | J. Fernando Barbero G. | J. Fernando Barbero G., Eduardo J. S. Villase\~nor | Generating functions for black hole entropy in Loop Quantum Gravity | nine pages | Phys.Rev.D77:121502,2008 | 10.1103/PhysRevD.77.121502 | null | gr-qc math-ph math.CO math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce, in a systematic way, a set of generating functions that solve
all the different combinatorial problems that crop up in the study of black
hole entropy in Loop Quantum Gravity. Specifically we give generating functions
for: The different sources of degeneracy related to the spectrum of the area
operator,... | [
{
"created": "Wed, 30 Apr 2008 10:42:42 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"G.",
"J. Fernando Barbero",
""
],
[
"Villaseñor",
"Eduardo J. S.",
""
]
] | We introduce, in a systematic way, a set of generating functions that solve all the different combinatorial problems that crop up in the study of black hole entropy in Loop Quantum Gravity. Specifically we give generating functions for: The different sources of degeneracy related to the spectrum of the area operator, t... |
1110.6880 | Michael Sachs | Michael K. Sachs | Testing Lattice Quantum Gravity in 2+1 Dimensions | 13 pages, 11 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Borrowing techniques from cosmology, I compute the power spectrum of quantum
fluctuations in (2+1)-dimensional causal dynamical triangulations, a promising
discrete path integral approach to quantum gravity. The results agree with
those of canonical quantization to a high degree of precision, providing strong
evidenc... | [
{
"created": "Mon, 31 Oct 2011 18:12:59 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Nov 2011 23:38:44 GMT",
"version": "v2"
}
] | 2011-11-03 | [
[
"Sachs",
"Michael K.",
""
]
] | Borrowing techniques from cosmology, I compute the power spectrum of quantum fluctuations in (2+1)-dimensional causal dynamical triangulations, a promising discrete path integral approach to quantum gravity. The results agree with those of canonical quantization to a high degree of precision, providing strong evidence ... |
gr-qc/0506076 | Athanasios Prikas | Athanasios Prikas | Q-stars in scalar-tensor gravitational theories | 14 pages, to appear in Phys. Lett. B | Phys.Lett. B620 (2005) 88-96 | 10.1016/j.physletb.2005.06.022 | null | gr-qc | null | We study q-stars in Brans-Dicke gravitational theory. We find that when the
Brans-Dicke constant, $\omega_{\textrm{BD}}$, tends to infinity, the results of
General Relativity are reproduced. For other values of $\omega_{\textrm{BD}}$,
the particle number, mass and radius of the star and the absolute value of the
matt... | [
{
"created": "Sun, 12 Jun 2005 18:50:51 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Prikas",
"Athanasios",
""
]
] | We study q-stars in Brans-Dicke gravitational theory. We find that when the Brans-Dicke constant, $\omega_{\textrm{BD}}$, tends to infinity, the results of General Relativity are reproduced. For other values of $\omega_{\textrm{BD}}$, the particle number, mass and radius of the star and the absolute value of the matter... |
0711.4797 | Ulf Leonhardt | Thomas G. Philbin, Chris Kuklewicz, Scott Robertson, Stephen Hill,
Friedrich Konig, Ulf Leonhardt | Fiber-optical analogue of the event horizon: Appendices | null | null | null | null | gr-qc | null | We explain the theory behind our fiber-optical analogue of the event horizon
and present the experiment in detail.
| [
{
"created": "Thu, 29 Nov 2007 19:08:18 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Dec 2007 09:58:47 GMT",
"version": "v2"
}
] | 2007-12-13 | [
[
"Philbin",
"Thomas G.",
""
],
[
"Kuklewicz",
"Chris",
""
],
[
"Robertson",
"Scott",
""
],
[
"Hill",
"Stephen",
""
],
[
"Konig",
"Friedrich",
""
],
[
"Leonhardt",
"Ulf",
""
]
] | We explain the theory behind our fiber-optical analogue of the event horizon and present the experiment in detail. |
1406.7375 | Panagiotis Iosif | Panagiotis Iosif and Nikolaos Stergioulas | On the accuracy of the IWM-CFC approximation in differentially rotating
relativistic stars | 12 pages, 5 figures, 2 tables, updated to match version accepted for
publication in General Relativity and Gravitation | null | 10.1007/s10714-014-1800-5 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We determine the accuracy of the conformal flatness (IWM-CFC) approximation
for the case of single, but strongly differentially rotating relativistic
stars. We find that for the fastest rotating and most relativistic polytropic
models, the deviation from full general relativity is below 5% for integrated
quantities a... | [
{
"created": "Sat, 28 Jun 2014 09:15:53 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Sep 2014 12:34:50 GMT",
"version": "v2"
}
] | 2014-09-23 | [
[
"Iosif",
"Panagiotis",
""
],
[
"Stergioulas",
"Nikolaos",
""
]
] | We determine the accuracy of the conformal flatness (IWM-CFC) approximation for the case of single, but strongly differentially rotating relativistic stars. We find that for the fastest rotating and most relativistic polytropic models, the deviation from full general relativity is below 5% for integrated quantities and... |
1302.5217 | Vladimir Folomeev | Vladimir Dzhunushaliev, Vladimir Folomeev, Burkhard Kleihaus, Jutta
Kunz | Mixed neutron-star-plus-wormhole systems: Linear stability analysis | 15 pages, 4 figures, minor corrections to content, references added,
version published in PRD | Phys. Rev. D 87, 104036 (2013) | 10.1103/PhysRevD.87.104036 | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider configurations consisting of a neutron star with a wormhole at
the core. The wormhole is held open by a ghost scalar field with a quartic
coupling. The neutron matter is described by a perfect fluid with a polytropic
equation of state. We obtain static regular solutions for these systems. A
stability anal... | [
{
"created": "Thu, 21 Feb 2013 08:56:58 GMT",
"version": "v1"
},
{
"created": "Sun, 2 Jun 2013 11:11:44 GMT",
"version": "v2"
}
] | 2013-06-04 | [
[
"Dzhunushaliev",
"Vladimir",
""
],
[
"Folomeev",
"Vladimir",
""
],
[
"Kleihaus",
"Burkhard",
""
],
[
"Kunz",
"Jutta",
""
]
] | We consider configurations consisting of a neutron star with a wormhole at the core. The wormhole is held open by a ghost scalar field with a quartic coupling. The neutron matter is described by a perfect fluid with a polytropic equation of state. We obtain static regular solutions for these systems. A stability analys... |
gr-qc/9905091 | Mark Trodden | Mark Trodden and Tanmay Vachaspati | What is the Homogeneity of our Universe Telling Us? | 6 pages. Awarded Honorable Mention in the 1999 Gravity Research
Foundation Essay Competition | Mod.Phys.Lett. A14 (1999) 1661-1666 | 10.1142/S0217732399001747 | CWRU-P20-99 | gr-qc astro-ph | null | The universe we observe is homogeneous on super-horizon scales, leading to
the ``cosmic homogeneity problem''. Inflation alleviates this problem but
cannot solve it within the realm of conservative extrapolations of classical
physics. A probabilistic solution of the problem is possible but is subject to
interpretatio... | [
{
"created": "Mon, 24 May 1999 16:27:44 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Trodden",
"Mark",
""
],
[
"Vachaspati",
"Tanmay",
""
]
] | The universe we observe is homogeneous on super-horizon scales, leading to the ``cosmic homogeneity problem''. Inflation alleviates this problem but cannot solve it within the realm of conservative extrapolations of classical physics. A probabilistic solution of the problem is possible but is subject to interpretationa... |
2211.11585 | Mariano Cadoni | M. Cadoni, M. De Laurentis, I. De Martino, R. Della Monica, M. Oi, and
A. P. Sanna | Are nonsingular black holes with super-Planckian hair ruled out by S2
star data? | 6 pages, 2 figures, 1 table. Revised version: Addendum and some
references have been added | null | 10.1103/PhysRevD.107.044038 | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | We propose a novel nonsingular black-hole spacetime representing a strong
deformation of the Schwarzschild solution with mass $M$ by an additional hair
$\ell$, which may be hierarchically larger than the Planck scale. Our
black-hole model presents a de Sitter core and $\mathcal{O}(\ell^2/r^2)$
slow-decaying correctio... | [
{
"created": "Mon, 21 Nov 2022 15:38:12 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Nov 2022 11:06:00 GMT",
"version": "v2"
}
] | 2023-03-01 | [
[
"Cadoni",
"M.",
""
],
[
"De Laurentis",
"M.",
""
],
[
"De Martino",
"I.",
""
],
[
"Della Monica",
"R.",
""
],
[
"Oi",
"M.",
""
],
[
"Sanna",
"A. P.",
""
]
] | We propose a novel nonsingular black-hole spacetime representing a strong deformation of the Schwarzschild solution with mass $M$ by an additional hair $\ell$, which may be hierarchically larger than the Planck scale. Our black-hole model presents a de Sitter core and $\mathcal{O}(\ell^2/r^2)$ slow-decaying corrections... |
gr-qc/0404053 | Julio Cesar Fabris | J.C. Fabris, S.V.B. Goncalves and M.S. dos Santos | Gravitational waves in the generalized Chaplygin gas model | Latex file, 9 pages, 11 figures eps format | Gen.Rel.Grav. 36 (2004) 2559-2572 | 10.1023/B:GERG.0000046854.75501.bf | null | gr-qc astro-ph | null | The consequences of taking the generalized Chaplygin gas as the dark energy
constituent of the Universe on the gravitational waves are studied and the
spectrum obtained from this model, for the flat case, is analyzed. Besides its
importance for the study of the primordial Universe, the gravitational waves
represent a... | [
{
"created": "Mon, 12 Apr 2004 22:02:08 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Fabris",
"J. C.",
""
],
[
"Goncalves",
"S. V. B.",
""
],
[
"Santos",
"M. S. dos",
""
]
] | The consequences of taking the generalized Chaplygin gas as the dark energy constituent of the Universe on the gravitational waves are studied and the spectrum obtained from this model, for the flat case, is analyzed. Besides its importance for the study of the primordial Universe, the gravitational waves represent an ... |
gr-qc/0203069 | cherubini Christian | Donato Bini, Christian Cherubini, Robert T Jantzen, Remo J. Ruffini | Teukolsky Master Equation: De Rham wave equation for the gravitational
and electromagnetic fields in vacuum | 30 pages. No figures. Used PTP macros. To appear on Prog. Theor.
Phys., Vol. 107, No. 5, May 2002 | Prog.Theor.Phys. 107 (2002) 967-992 | 10.1143/PTP.107.967 | null | gr-qc | null | A new version of the Teukolksy Master Equation, describing any massless field
of different spin $s=1/2,1,3/2,2$ in the Kerr black hole, is presented here in
the form of a wave equation containing additional curvature terms. These
results suggest a relation between curvature perturbation theory in general
relativity a... | [
{
"created": "Thu, 21 Mar 2002 11:54:53 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Bini",
"Donato",
""
],
[
"Cherubini",
"Christian",
""
],
[
"Jantzen",
"Robert T",
""
],
[
"Ruffini",
"Remo J.",
""
]
] | A new version of the Teukolksy Master Equation, describing any massless field of different spin $s=1/2,1,3/2,2$ in the Kerr black hole, is presented here in the form of a wave equation containing additional curvature terms. These results suggest a relation between curvature perturbation theory in general relativity and... |
2309.16944 | Chao-Jun Feng | Ke Wang, Chao-Jun Feng, Towe Wang | Image of Kerr-de Sitter black holes illuminated by equatorial thin
accretion disks | 17 pages, 10 figures, refs added, typos corrected | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To explore the influence of the cosmological constant on black hole images,
we have developed a comprehensive analytical method for simulating images of
Kerr-de Sitter black holes illuminated by equatorial thin accretion disks.
Through the application of explicit equations, we simulate images of Kerr-de
Sitter black ... | [
{
"created": "Fri, 29 Sep 2023 03:02:57 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Dec 2023 08:55:18 GMT",
"version": "v2"
},
{
"created": "Tue, 19 Dec 2023 04:17:51 GMT",
"version": "v3"
},
{
"created": "Tue, 30 Apr 2024 07:14:13 GMT",
"version": "v4"
}
] | 2024-05-01 | [
[
"Wang",
"Ke",
""
],
[
"Feng",
"Chao-Jun",
""
],
[
"Wang",
"Towe",
""
]
] | To explore the influence of the cosmological constant on black hole images, we have developed a comprehensive analytical method for simulating images of Kerr-de Sitter black holes illuminated by equatorial thin accretion disks. Through the application of explicit equations, we simulate images of Kerr-de Sitter black ho... |
1612.00974 | Gabriel Farrugia | Gabriel Farrugia, Jackson Levi Said | Growth factor in $f(T,\mathcal{T})$ gravity | 21 pages, 12 figures | Phys. Rev. D 94, 124004 (2016) | 10.1103/PhysRevD.94.124004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the growth factor for sub-horizon modes during late times in
$f(T,\mathcal{T})$ gravity, where $T$ is the torsion scalar and $\mathcal{T}$
is the trace of the stress-energy tensor. This is achieved by obtaining the
modified M\'{e}sz\'{a}ros equation, which describes the evolution of the
perturbations o... | [
{
"created": "Sat, 3 Dec 2016 15:42:24 GMT",
"version": "v1"
}
] | 2016-12-06 | [
[
"Farrugia",
"Gabriel",
""
],
[
"Said",
"Jackson Levi",
""
]
] | We investigate the growth factor for sub-horizon modes during late times in $f(T,\mathcal{T})$ gravity, where $T$ is the torsion scalar and $\mathcal{T}$ is the trace of the stress-energy tensor. This is achieved by obtaining the modified M\'{e}sz\'{a}ros equation, which describes the evolution of the perturbations of ... |
1012.5605 | Farook Rahaman | A A Usmani, Farook Rahaman, Saibal Ray, K K Nandi, Peter K. F.
Kuhfittig, Sk. A Rakib, Z Hasan | Charged gravastars admitting conformal motion | Minor addition, Accepted in Phys. Lett. B | null | 10.1016/j.physletb.2011.06.001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new model of a {\it gravastar} admitting conformal motion. While
retaining the framework of the Mazur-Mottola model, the gravastar is assumed to
be internally charged, with an exterior defined by a Reissner-Nordstr{\"o}m
rather than a Schwarzschild line element. The solutions obtained involve (i)
the int... | [
{
"created": "Mon, 27 Dec 2010 12:34:00 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Jun 2011 16:08:26 GMT",
"version": "v2"
}
] | 2011-06-06 | [
[
"Usmani",
"A A",
""
],
[
"Rahaman",
"Farook",
""
],
[
"Ray",
"Saibal",
""
],
[
"Nandi",
"K K",
""
],
[
"Kuhfittig",
"Peter K. F.",
""
],
[
"Rakib",
"Sk. A",
""
],
[
"Hasan",
"Z",
""
]
] | We propose a new model of a {\it gravastar} admitting conformal motion. While retaining the framework of the Mazur-Mottola model, the gravastar is assumed to be internally charged, with an exterior defined by a Reissner-Nordstr{\"o}m rather than a Schwarzschild line element. The solutions obtained involve (i) the inter... |
0710.1562 | Torsten Asselmeyer-Maluga | Torsten Asselmeyer-Maluga and Helge Rose | Dark energy and 3-manifold topology | 7 pages, no figures | ActaPhys.Polon.B38:3633-3640,2007 | null | null | gr-qc | null | We show that the differential-geometric description of matter by differential
structures of spacetime leads to a unifying model of the three types of energy
in the cosmos: matter, dark matter and dark energy. Using this model we are
able to calculate the ratio of dark energy to the total energy of the cosmos.
| [
{
"created": "Mon, 8 Oct 2007 14:40:33 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Nov 2007 08:49:27 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Asselmeyer-Maluga",
"Torsten",
""
],
[
"Rose",
"Helge",
""
]
] | We show that the differential-geometric description of matter by differential structures of spacetime leads to a unifying model of the three types of energy in the cosmos: matter, dark matter and dark energy. Using this model we are able to calculate the ratio of dark energy to the total energy of the cosmos. |
2311.15019 | Hari K | Hari K, Subhajit Barman and Dawood Kothawala | Universal role of curvature in vacuum entanglement | Published in PRD, 28 pages and 15 figures | Phys. Rev. D 109 (2024) 6, 065017 | 10.1103/PhysRevD.109.065017 | null | gr-qc hep-th quant-ph | http://creativecommons.org/licenses/by/4.0/ | We highlight some universal features concerning the role of spacetime
curvature in the entanglement induced between quantum probes coupled to a
quantum field in a suitable vacuum state. The probes are initially causally
disconnected and non-entangled. We explore the parameter space $\{{\omega},
d_0, \boldsymbol{v}_0\... | [
{
"created": "Sat, 25 Nov 2023 13:14:33 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Mar 2024 08:31:58 GMT",
"version": "v2"
}
] | 2024-03-20 | [
[
"K",
"Hari",
""
],
[
"Barman",
"Subhajit",
""
],
[
"Kothawala",
"Dawood",
""
]
] | We highlight some universal features concerning the role of spacetime curvature in the entanglement induced between quantum probes coupled to a quantum field in a suitable vacuum state. The probes are initially causally disconnected and non-entangled. We explore the parameter space $\{{\omega}, d_0, \boldsymbol{v}_0\}$... |
2102.05519 | Shahar Hod | Shahar Hod | Hawking radiation may violate the Penrose cosmic censorship conjecture | 5 pages. This essay received an Honorable Mention from the Gravity
Research Foundation 2019 | International Journal of Modern Physics D 28, 1944023 (2019) | 10.1142/S0218271819440231 | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | We analyze the Hawking evaporation process of Reissner-Nordstr\"om black
holes. It is shown that the characteristic radiation quanta emitted by the
charged black holes may turn near-extremal black-hole spacetimes into
horizonless naked singularities. The present analysis therefore reveals the
intriguing possibility t... | [
{
"created": "Wed, 10 Feb 2021 16:02:59 GMT",
"version": "v1"
}
] | 2021-02-17 | [
[
"Hod",
"Shahar",
""
]
] | We analyze the Hawking evaporation process of Reissner-Nordstr\"om black holes. It is shown that the characteristic radiation quanta emitted by the charged black holes may turn near-extremal black-hole spacetimes into horizonless naked singularities. The present analysis therefore reveals the intriguing possibility tha... |
1008.2671 | S Habib Mazharimousavi | S. Habib Mazharimousavi and M. Halilsoy | Domain-Walls in Einstein-Gauss-Bonnet Bulk | 4 pages and 4 figures, to appear in PRD | Phys.Rev.D82:087502,2010 | 10.1103/PhysRevD.82.087502 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the dynamics of a d-dimensional domain wall (DW) in a
d+1-dimensional Einstein-Gauss-Bonnet (EGB) bulk. Exact effective potential
induced by the Gauss-Bonnet (GB) term on the wall is derived. In the absence of
the GB term we recover the familiar gravitational and anti-harmonic oscillator
potentials. In... | [
{
"created": "Mon, 16 Aug 2010 14:37:44 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Sep 2010 19:27:51 GMT",
"version": "v2"
}
] | 2010-10-28 | [
[
"Mazharimousavi",
"S. Habib",
""
],
[
"Halilsoy",
"M.",
""
]
] | We investigate the dynamics of a d-dimensional domain wall (DW) in a d+1-dimensional Einstein-Gauss-Bonnet (EGB) bulk. Exact effective potential induced by the Gauss-Bonnet (GB) term on the wall is derived. In the absence of the GB term we recover the familiar gravitational and anti-harmonic oscillator potentials. Incl... |
gr-qc/9806071 | null | Dan N. Vollick | Maintaining a Wormhole with a Scalar Field | 12 pages, LaTex | Phys.Rev. D56 (1997) 4724-4728 | 10.1103/PhysRevD.56.4724 | null | gr-qc | null | It is well known that it takes matter that violates the averaged weak energy
condition to hold the throat of a wormhole open. The production of such
``exotic'' matter is usually discussed within the context of quantum field
theory. In this paper I show that it is possible to produce the exotic matter
required to hold... | [
{
"created": "Tue, 16 Jun 1998 19:57:39 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Vollick",
"Dan N.",
""
]
] | It is well known that it takes matter that violates the averaged weak energy condition to hold the throat of a wormhole open. The production of such ``exotic'' matter is usually discussed within the context of quantum field theory. In this paper I show that it is possible to produce the exotic matter required to hold a... |
2205.09147 | Leonardo Chataignier | Leonardo Chataignier | Beyond semiclassical time | null | Z.Naturforsch.A (2022) | 10.1515/zna-2022-0106 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the usual Born-Oppenheimer type of approximation used in quantum
gravity, in which a semiclassical time parameter emerges from a weak-coupling
expansion of the Wheeler-DeWitt constraint, leads to a unitary theory at least
up to the next-to-leading order in minisuperspace models. As there are no
unitarity... | [
{
"created": "Wed, 18 May 2022 18:03:19 GMT",
"version": "v1"
}
] | 2022-05-20 | [
[
"Chataignier",
"Leonardo",
""
]
] | We show that the usual Born-Oppenheimer type of approximation used in quantum gravity, in which a semiclassical time parameter emerges from a weak-coupling expansion of the Wheeler-DeWitt constraint, leads to a unitary theory at least up to the next-to-leading order in minisuperspace models. As there are no unitarity-v... |
0904.1562 | Lorenzo Iorio | Lorenzo Iorio | Constraints on planet X/Nemesis from Solar System's inner dynamics | LaTex, MNRAS macros. 12 pages, 4 figures, 3 tables. To appear in
Monthly Notices of the Royal Astronomical Society (MNRAS). Some typos fixed | Mon.Not.Roy.Astron.Soc.400:346-353,2009 | 10.1111/j.1365-2966.2009.15458.x | null | gr-qc astro-ph.EP physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We put full 3D constraints on a putative planet X by using the dynamics of
the inner planets of the solar system. In particular, we compute the mimium
distance of X as a function of its heliocentric latitude and longitude for
different values of its mass.
| [
{
"created": "Thu, 9 Apr 2009 17:02:58 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Apr 2009 12:43:34 GMT",
"version": "v2"
},
{
"created": "Sun, 17 May 2009 01:17:18 GMT",
"version": "v3"
},
{
"created": "Wed, 29 Jul 2009 11:10:48 GMT",
"version": "v4"
}
] | 2009-11-12 | [
[
"Iorio",
"Lorenzo",
""
]
] | We put full 3D constraints on a putative planet X by using the dynamics of the inner planets of the solar system. In particular, we compute the mimium distance of X as a function of its heliocentric latitude and longitude for different values of its mass. |
1609.02040 | Olivier Brunet | Olivier Brunet | Geometric Time and Causal Time in Relativistic Lagrangian Mechanics | null | null | null | null | gr-qc math-ph math.MP physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we argue that two distinct types of time should be taken
into account in relativistic physics: a geometric time, which emanates from the
structure of spacetime and its metrics, and a causal time, indicating the flow
from the past to the future. A particularity of causal times is that its values
have ... | [
{
"created": "Tue, 6 Sep 2016 08:37:15 GMT",
"version": "v1"
}
] | 2016-09-08 | [
[
"Brunet",
"Olivier",
""
]
] | In this article, we argue that two distinct types of time should be taken into account in relativistic physics: a geometric time, which emanates from the structure of spacetime and its metrics, and a causal time, indicating the flow from the past to the future. A particularity of causal times is that its values have no... |
1401.3578 | Claus Kiefer | Claus Kiefer | Conceptual Problems in Quantum Gravity and Quantum Cosmology | 41 pages, invited review | ISRN Math.Phys. 2013 (2013) 509316 | 10.1155/2013/509316 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The search for a consistent and empirically established quantum theory of
gravity is among the biggest open problems of fundamental physics. The
obstacles are of formal and of conceptual nature. Here, I address the main
conceptual problems, discuss their present status and outline further
directions of research. For ... | [
{
"created": "Wed, 15 Jan 2014 13:43:36 GMT",
"version": "v1"
}
] | 2014-01-16 | [
[
"Kiefer",
"Claus",
""
]
] | The search for a consistent and empirically established quantum theory of gravity is among the biggest open problems of fundamental physics. The obstacles are of formal and of conceptual nature. Here, I address the main conceptual problems, discuss their present status and outline further directions of research. For th... |
1307.2969 | Yu-Xiao Liu | Ke Yang, Xiao-Long Du, Yu-Xiao Liu | Linear perturbations in Eddington-inspired Born-Infeld gravity | 11 pages, no figures, published version | Phys. Rev. D 88, 124037 (2013) | 10.1103/PhysRevD.88.124037 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the full linear perturbations of a homogeneous and isotropic
spacetime in the Eddington-inspired Born-Infeld gravity. The stability of the
perturbations are analyzed in the Eddington regime. We find that, for positive
$\kappa$, the scalar modes are stable in the infinite wavelength limit ($k=0$)
but unstable... | [
{
"created": "Thu, 11 Jul 2013 04:16:27 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Jul 2013 12:01:15 GMT",
"version": "v2"
},
{
"created": "Sun, 5 Jan 2014 08:29:29 GMT",
"version": "v3"
}
] | 2014-01-07 | [
[
"Yang",
"Ke",
""
],
[
"Du",
"Xiao-Long",
""
],
[
"Liu",
"Yu-Xiao",
""
]
] | We study the full linear perturbations of a homogeneous and isotropic spacetime in the Eddington-inspired Born-Infeld gravity. The stability of the perturbations are analyzed in the Eddington regime. We find that, for positive $\kappa$, the scalar modes are stable in the infinite wavelength limit ($k=0$) but unstable f... |
gr-qc/9910076 | Tetsuya Shiromizu | Tetsuya Shiromizu, Kei-ichi Maeda, Misao Sasaki | The Einstein Equations on the 3-Brane World | 8 pages, references added | Phys.Rev.D62:024012,2000 | 10.1103/PhysRevD.62.024012 | DAMTP-1999-150; NI99018-SFU; UTAP-349; RESCEU-40/99; WU-AP/85/99;
OUTAP-103 | gr-qc astro-ph hep-ph hep-th | null | We carefully investigate the gravitational equations of the brane world, in
which all the matter forces except gravity are confined on the 3-brane in a
5-dimensional spacetime with $Z_2$ symmetry.
We derive the effective gravitational equations on the brane, which reduce to
the conventional Einstein equations in th... | [
{
"created": "Fri, 22 Oct 1999 09:33:09 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Oct 1999 11:06:29 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Jan 2000 11:21:52 GMT",
"version": "v3"
}
] | 2009-10-09 | [
[
"Shiromizu",
"Tetsuya",
""
],
[
"Maeda",
"Kei-ichi",
""
],
[
"Sasaki",
"Misao",
""
]
] | We carefully investigate the gravitational equations of the brane world, in which all the matter forces except gravity are confined on the 3-brane in a 5-dimensional spacetime with $Z_2$ symmetry. We derive the effective gravitational equations on the brane, which reduce to the conventional Einstein equations in the lo... |
2405.20349 | Vahideh Memari Rishakani | M. Halilsoy and V. Memari | Charged particle geodesics and closed timelike curves in an
electromagnetic universe | 13 pages, 5 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spinning electromagnetic universe, known also as the Rotating
Bertotti-Robinson(RBR) spacetime is considered as a model to represent our
cosmos. The model derives from different physical considerations, such as
colliding waves, throat region, and near horizon geometry of the Kerr-Newman
black hole. Our interest i... | [
{
"created": "Mon, 27 May 2024 09:08:08 GMT",
"version": "v1"
}
] | 2024-06-03 | [
[
"Halilsoy",
"M.",
""
],
[
"Memari",
"V.",
""
]
] | The spinning electromagnetic universe, known also as the Rotating Bertotti-Robinson(RBR) spacetime is considered as a model to represent our cosmos. The model derives from different physical considerations, such as colliding waves, throat region, and near horizon geometry of the Kerr-Newman black hole. Our interest is ... |
0911.3889 | Carlos Palenzuela | Carlos Palenzuela, Luis Lehner, Shin Yoshida | Understanding possible electromagnetic counterparts to loud
gravitational wave events: Binary black hole effects on electromagnetic
fields | 12 pages | Phys.Rev.D81:084007,2010 | 10.1103/PhysRevD.81.084007 | pi-other-166 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In addition to producing loud gravitational waves (GW), the dynamics of a
binary black hole system could induce emission of electromagnetic (EM)
radiation by affecting the behavior of plasmas and electromagnetic fields in
their vicinity. We here study how the electromagnetic fields are affected by a
pair of orbiting ... | [
{
"created": "Thu, 19 Nov 2009 20:48:18 GMT",
"version": "v1"
}
] | 2010-04-21 | [
[
"Palenzuela",
"Carlos",
""
],
[
"Lehner",
"Luis",
""
],
[
"Yoshida",
"Shin",
""
]
] | In addition to producing loud gravitational waves (GW), the dynamics of a binary black hole system could induce emission of electromagnetic (EM) radiation by affecting the behavior of plasmas and electromagnetic fields in their vicinity. We here study how the electromagnetic fields are affected by a pair of orbiting bl... |
1409.2607 | Hirofumi Sakuma | Hirofumi Sakuma | Note on a novel vortex dynamics of spacetime as a heuristic model of the
vacuum energy | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Vortex or spin is an important and ubiquitous form of motions existing in
almost all scale ranges of the universe and its dynamics is still an active
research theme in the classical as well as modern physics. As a novel attempt
of such studies, here we show that a class of vortex dynamics generated by
newly defined C... | [
{
"created": "Tue, 9 Sep 2014 06:06:55 GMT",
"version": "v1"
}
] | 2014-09-10 | [
[
"Sakuma",
"Hirofumi",
""
]
] | Vortex or spin is an important and ubiquitous form of motions existing in almost all scale ranges of the universe and its dynamics is still an active research theme in the classical as well as modern physics. As a novel attempt of such studies, here we show that a class of vortex dynamics generated by newly defined Cle... |
1805.11626 | Steffen Gielen | Steffen Gielen, Rodrigo de Leon Ardon, Roberto Percacci | Gravity with more or less gauging | 24 pages, 1 table, 1 figure; minor changes to match published version | Class. Quantum Grav. 35 (2018), 195009 | 10.1088/1361-6382/aadbd1 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | General Relativity is usually formulated as a theory with gauge invariance
under the diffeomorphism group, but there is a 'dilaton' formulation where it
is in addition invariant under Weyl transformations, and a 'unimodular'
formulation where it is only invariant under the smaller group of special
diffeomorphisms. Ot... | [
{
"created": "Tue, 29 May 2018 18:00:12 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Aug 2018 15:21:59 GMT",
"version": "v2"
}
] | 2018-09-11 | [
[
"Gielen",
"Steffen",
""
],
[
"Ardon",
"Rodrigo de Leon",
""
],
[
"Percacci",
"Roberto",
""
]
] | General Relativity is usually formulated as a theory with gauge invariance under the diffeomorphism group, but there is a 'dilaton' formulation where it is in addition invariant under Weyl transformations, and a 'unimodular' formulation where it is only invariant under the smaller group of special diffeomorphisms. Othe... |
1211.1407 | Mu-Tao Wang | Mu-Tao Wang | Quasilocal mass and surface Hamiltonian in spacetime | 11 pages, contribution to ICMP 2012 | null | null | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the concepts of energy and mass in relativity. On a finitely
extended spatial region, they lead to the notion of quasilocal energy/mass for
the boundary 2-surface in spacetime. A new definition was found in [27] that
satisfies the positivity, rigidity, and asymptotics properties. The definition
makes use o... | [
{
"created": "Tue, 6 Nov 2012 21:40:56 GMT",
"version": "v1"
}
] | 2012-11-08 | [
[
"Wang",
"Mu-Tao",
""
]
] | We discuss the concepts of energy and mass in relativity. On a finitely extended spatial region, they lead to the notion of quasilocal energy/mass for the boundary 2-surface in spacetime. A new definition was found in [27] that satisfies the positivity, rigidity, and asymptotics properties. The definition makes use of ... |
2004.05081 | Igor Fomin | A.N. Morozov, V.I. Pustovoit and I.V. Fomin | Bound gravitational waves in a dielectric medium and a constant magnetic
field | 8 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A description is made of the process of excitation of bound
longitudinal-transverse gravitational waves during the propagation of
electromagnetic waves in a dielectric medium. It is shown that the speed of
such gravitational waves is less than the speed of light in a vacuum and
coincides with the speed of an electrom... | [
{
"created": "Fri, 10 Apr 2020 15:53:27 GMT",
"version": "v1"
}
] | 2020-04-13 | [
[
"Morozov",
"A. N.",
""
],
[
"Pustovoit",
"V. I.",
""
],
[
"Fomin",
"I. V.",
""
]
] | A description is made of the process of excitation of bound longitudinal-transverse gravitational waves during the propagation of electromagnetic waves in a dielectric medium. It is shown that the speed of such gravitational waves is less than the speed of light in a vacuum and coincides with the speed of an electromag... |
2211.02008 | Devansh Shukla | Devansh Shukla, Abhay Menon A, Kamlesh Pathak | Orbital Motion of a test particle around a Schwarzschild's Black Hole in
STVG gravity | 7 pages, 6 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this article, we have examined the existence of a static spherically
symmetric solution in the Scalar Tensor Vector Gravity (STVG) and investigated
its horizon distances to develop boundary limitations for our test particle. We
have computed the Kretschmann invariant of the metric to study the
singularities and ve... | [
{
"created": "Thu, 3 Nov 2022 17:26:12 GMT",
"version": "v1"
}
] | 2022-11-04 | [
[
"Shukla",
"Devansh",
""
],
[
"A",
"Abhay Menon",
""
],
[
"Pathak",
"Kamlesh",
""
]
] | In this article, we have examined the existence of a static spherically symmetric solution in the Scalar Tensor Vector Gravity (STVG) and investigated its horizon distances to develop boundary limitations for our test particle. We have computed the Kretschmann invariant of the metric to study the singularities and veri... |
1403.0771 | Francisco Lobo | Tiberiu Harko, Francisco S. N. Lobo, M. K. Mak | Wormhole geometries supported by quark matter at ultra-high densities | 11 pages. V2: 12 pages, major revision and modifications; accepted
for publication in the International Journal of Modern Physics D | Int.J.Mod.Phys.D24:1550006,2015 | 10.1142/S0218271815500066 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A fundamental ingredient in wormhole physics is the presence of exotic
matter, which involves the violation of the null energy condition. In this
context, we investigate the possibility that wormholes could be supported by
quark matter at extreme densities. Theoretical and experimental investigations
of the structure... | [
{
"created": "Tue, 4 Mar 2014 12:57:21 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Oct 2014 22:04:23 GMT",
"version": "v2"
}
] | 2014-11-13 | [
[
"Harko",
"Tiberiu",
""
],
[
"Lobo",
"Francisco S. N.",
""
],
[
"Mak",
"M. K.",
""
]
] | A fundamental ingredient in wormhole physics is the presence of exotic matter, which involves the violation of the null energy condition. In this context, we investigate the possibility that wormholes could be supported by quark matter at extreme densities. Theoretical and experimental investigations of the structure o... |
0807.3872 | Valerio Bozza | V. Bozza | A comparison of approximate gravitational lens equations and a proposal
for an improved new one | 11 pages, 6 figures, to appear on Physical Review D | Phys.Rev.D78:103005,2008 | 10.1103/PhysRevD.78.103005 | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Keeping the exact general relativistic treatment of light bending as a
reference, we compare the accuracy of commonly used approximate lens equations.
We conclude that the best approximate lens equation is the Ohanian lens
equation, for which we present a new expression in terms of distances between
observer, lens an... | [
{
"created": "Thu, 24 Jul 2008 12:44:08 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Oct 2008 21:26:53 GMT",
"version": "v2"
}
] | 2008-12-18 | [
[
"Bozza",
"V.",
""
]
] | Keeping the exact general relativistic treatment of light bending as a reference, we compare the accuracy of commonly used approximate lens equations. We conclude that the best approximate lens equation is the Ohanian lens equation, for which we present a new expression in terms of distances between observer, lens and ... |
2202.12681 | Charles Robson | Charles W. Robson and Marco Ornigotti | Take the A-Metric: Interpretations of Some Known Solutions of Einstein's
Vacuum Field Equations | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we present a new interpretation of the only static vacuum
solution of Einstein's field equations with planar symmetry, the Taub solution.
This solution is a member of the $AIII$ class of metrics, along with the type D
Kasner solution. Various interpretations of these solutions have been put
forward prev... | [
{
"created": "Fri, 25 Feb 2022 13:36:29 GMT",
"version": "v1"
}
] | 2022-02-28 | [
[
"Robson",
"Charles W.",
""
],
[
"Ornigotti",
"Marco",
""
]
] | In this work, we present a new interpretation of the only static vacuum solution of Einstein's field equations with planar symmetry, the Taub solution. This solution is a member of the $AIII$ class of metrics, along with the type D Kasner solution. Various interpretations of these solutions have been put forward previo... |
1005.5151 | Federico Piazza | Federico Piazza | Gauss-Codazzi thermodynamics on the timelike screen | 8+1 pages, final version | Phys.Rev.D82:084004,2010 | 10.1103/PhysRevD.82.084004 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is a known result by Jacobson that the flux of energy-matter through a
local Rindler horizon is related with the expansion of the null generators in a
way that mirrors the first law of thermodynamics. We extend such a result to a
timelike screen of observers with finite acceleration. Since timelike curves
have mor... | [
{
"created": "Thu, 27 May 2010 19:14:12 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Oct 2010 15:43:43 GMT",
"version": "v2"
}
] | 2014-11-21 | [
[
"Piazza",
"Federico",
""
]
] | It is a known result by Jacobson that the flux of energy-matter through a local Rindler horizon is related with the expansion of the null generators in a way that mirrors the first law of thermodynamics. We extend such a result to a timelike screen of observers with finite acceleration. Since timelike curves have more ... |
0805.3318 | Bernd Schroers | Catherine Meusburger and Bernd Schroers | Generalised Chern-Simons actions for 3d gravity and kappa-Poincare
symmetry | 31 pages, minor corrections and additional comments | Nucl.Phys.B806:462-488,2009 | 10.1016/j.nuclphysb.2008.06.023 | EMPG-08-05, pi-qg-79 | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider Chern-Simons theories for the Poincare, de Sitter and anti-de
Sitter groups in three dimensions which generalise the Chern-Simons formulation
of 3d gravity. We determine conditions under which kappa-Poincare symmetry and
its de Sitter and anti-de Sitter analogues can be associated to these theories
as qua... | [
{
"created": "Wed, 21 May 2008 17:35:03 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Jul 2008 15:15:10 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Meusburger",
"Catherine",
""
],
[
"Schroers",
"Bernd",
""
]
] | We consider Chern-Simons theories for the Poincare, de Sitter and anti-de Sitter groups in three dimensions which generalise the Chern-Simons formulation of 3d gravity. We determine conditions under which kappa-Poincare symmetry and its de Sitter and anti-de Sitter analogues can be associated to these theories as quant... |
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